CVE-2026-46132
📛 CVE Title
net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo
Description
In the Linux kernel, the following vulnerability has been resolved: net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo rtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack without initialisation: struct ifla_vf_broadcast vf_broadcast; The struct contains a single fixed 32-byte field: /* include/uapi/linux/if_link.h */ struct ifla_vf_broadcast { __u8 broadcast[32]; }; The function then copies dev->broadcast into it using dev->addr_len as the length: memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); On Ethernet devices (the overwhelming majority of SR-IOV NICs) dev->addr_len is 6, so only the first 6 bytes of broadcast[] are written. The remaining 26 bytes retain whatever was previously on the kernel stack. The full struct is then handed to userspace via: nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) leaking up to 26 bytes of uninitialised kernel stack per VF per RTM_GETLINK request, repeatable. The other vf_* structs in the same function are explicitly zeroed for exactly this reason - see the memset() calls for ivi, vf_vlan_info, node_guid and port_guid a few lines above. vf_broadcast was simply missed when it was added. Reachability: any unprivileged local process can open AF_NETLINK / NETLINK_ROUTE without capabilities and send RTM_GETLINK with an IFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks each VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per VF per request. Stack residue at this call site can include return addresses and transient sensitive data; KASAN with stack instrumentation, or KMSAN, will flag the nla_put() when reproduced. Zero the on-stack struct before the partial memcpy, matching the existing pattern used for the other vf_* structs in the same function.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- Linux
- CVSS severity
- high
- CVSS score
- 7.1 / 10
- CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H- Effective score
- 7.1 / 10 HIGH source: CNA overview
- MSRC score
- 5.5 / 10 MEDIUM MS rating: Moderate
- CWE(s)
- —
- Reserved
- 2026-05-13
- Published
- 2026-05-28 09:35 UTC
- Last updated
- 2026-06-01 16:18 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/46xxx/CVE-2026-46132.json
- Linked Threat
- CVE-2026-46132 — CVE-2026-46132
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-28 10:16:28 UTC
- NVD last modified
- 2026-06-24 17:51:37 UTC
- NVD CVSS v3.1
- 5.5 / 10 MEDIUM source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 1.8 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0013 (probability of exploitation in next 30 days)
- EPSS percentile
- 2.85% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01
NVD-assigned CWE(s):
CWE-908
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-08-01 17:03 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-32891 - Assigner
- Linux
- Published
- May 28, 2026, 9:35:47 AM
- Updated
- Jun 14, 2026, 5:56:50 PM
- EUVD base score
- 0.0 / 10
- EUVD-reported EPSS
- 0.1300
- Vendors
- Linux
- Products
-
Linux (patch: 6.18.30)Linux (patch: 5.10.258)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <38bcc21f52246badb3154b6158dcb381d98de011)Linux (patch: 7.0.7)Linux (patch: 6.6.140)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <a44fbb631cba646532f3948636626f81717365a7)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <fbe0e6197225e6a83cf113a67a4b425f8de0bcd5)Linux (patch: 0)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <0653c0516234c8258975d268a749115fc0f0ff00)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8)Linux (patch: 7.1)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <14271b401ec6a4bf0d88054106fc2956084717e1)Linux (patch: 6.12.88)Linux (5.3)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <4b9e327991815e128ad3af75c3a04630a63ce3e0)Linux (patch: 5.15.209)Linux (patch: 6.1.175)Linux (75345f888f700c4ab2448287e35d48c760b202e6 <cccce3190ba4356432b9f22369b56123d3d89f0d)
- Aliases
-
GHSA-m5g9-vgm2-5cvw
ENISA description: In the Linux kernel, the following vulnerability has been resolved: net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo rtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack without initialisation: struct ifla_vf_broadcast vf_broadcast; The struct contains a single fixed 32-byte field: /* include/uapi/linux/if_link.h */ struct ifla_vf_broadcast { __u8 broadcast[32]; }; The function then copies dev->broadcast into it using dev->addr_len as the length: memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len); On Ethernet devices (the overwhelming majority of SR-IOV NICs) dev->addr_len is 6, so only the first 6 bytes of broadcast[] are written. The remaining 26 bytes retain whatever was previously on the kernel stack. The full struct is then handed to userspace via: nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) leaking up to 26 bytes of uninitialised kernel stack per VF per RTM_GETLINK request, repeatable. The other vf_* structs in the same function are explicitly zeroed for exactly this reason - see the memset() calls for ivi, vf_vlan_info, node_guid and port_guid a few lines above. vf_broadcast was simply missed when it was added. Reachability: any unprivileged local process can open AF_NETLINK / NETLINK_ROUTE without capabilities and send RTM_GETLINK with an IFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks each VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per VF per request. Stack residue at this call site can include return addresses and transient sensitive data; KASAN with stack instrumentation, or KMSAN, will flag the nla_put() when reproduced. Zero the on-stack struct before the partial memcpy, matching the existing pattern used for the other vf_* structs in the same function.
EUVD references (8)
- https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1
- https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d
- https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7
- https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00
- https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8
- https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5
- https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011
- https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0
Microsoft Security Response Center MSRC
Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-12 01:09 UTC (source: CVRF).
- MS severity
- Moderate
- MS CVSS base score
- 5.5 / 10 (temporal 5.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U - Release
- 2026-May
Microsoft remediations / KB articles (2)
- CBL-Mariner Releases — Vendor Fix / Security Update (fixed build 6.6.141.1-1)
- https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / CBL-Mariner Releases
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Linux | Linux |
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected),
75345f888f700c4ab2448287e35d48c760b202e6 (affected)
|
— |
| Linux | Linux |
5.3 (affected),
0 (unaffected),
5.10.258 (unaffected),
5.15.209 (unaffected),
6.1.175 (unaffected),
6.6.140 (unaffected),
6.12.88 (unaffected),
6.18.30 (unaffected),
7.0.7 (unaffected),
7.1-rc3 (unaffected)
|
— |
Affected products — CPE 2.3 (3) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
Vendor references (8)
References embedded in the original CVE record by the assigning CNA.
- https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1
- https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d
- https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7
- https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00
- https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8
- https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5
- https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011
- https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0
Web references (13)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- MSRC update guide: CVE-2026-46132 msrc
- None Available msrc
- https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011 tenable:git.kernel.org
- https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0 tenable:git.kernel.org
- https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7 tenable:git.kernel.org
- https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8 tenable:git.kernel.org
- https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d tenable:git.kernel.org
- https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5 tenable:git.kernel.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-46132 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-46132 tenable:www.cve.org
- https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00 tenable:git.kernel.org
- https://www.first.org/epss/ tenable:www.first.org
- https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1 tenable:git.kernel.org
NVD-tagged references (8)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:access.redhat.com
Learn about our open source products, services, and company. You are here
2026-06-04 00:01 UTC -
web:access.redhat.com
Applying the kernel fix , when available, is the only comprehensive remediation . Option 1: Admin-only scope Setting ptrace_scope to 2 restricts ptrace attach to processes with CAP_SYS_PTRACE. This blocks many currently known exploitation paths, but other paths that do not rely on ptrace may exist. This is suitable for most production environments.
2026-06-04 00:01 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-04 00:01 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-04 00:01 UTC -
web:support.servicenow.com
Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...
2026-06-04 00:01 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-06-04 00:01 UTC -
web:www.microsoft.com
Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.
2026-06-04 00:01 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-06-04 00:01 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-04 00:01 UTC -
web:www.virustotal.com
VirusTotal is a platform for scanning files and URLs for viruses, malware, and other threats using multiple antivirus engines.
2026-06-04 00:01 UTC -
web:oradba.ch
On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching. What makes this quarter unusual: several key Release Updates, including 19.31 and 23.26.2, were not available on release day and are delayed by up to a week or more.
2026-06-19 02:28 UTC -
web:www.linkedin.com
Oracle has released its January 2026 Critical Patch Update (CPU), a wide-ranging security bulletin that addresses 337 newly identified vulnerabilities across a broad spectrum of its enterprise ...
2026-06-19 02:28 UTC -
web:www.oracle.com
Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.
2026-06-19 02:28 UTC -
web:www.rapid7.com
Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.
2026-06-19 02:28 UTC -
web:www.securityweek.com
Vulnerabilities Oracle's Second Monthly Security Updates Deliver 245 Patches Oracle has released its June 2026 Critical Security Patch Update to fix vulnerabilities in Communications, EBS, Enterprise Manager and other products.
2026-06-19 02:28 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:28 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-19 02:28 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-46132.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/rtnetlink.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "14271b401ec6a4bf0d88054106fc2956084717e1",
"status": "affected",
"version": "75345f888f700c4ab2448287e35d48c760b202e6",
"versionType": "git"
},
{
"lessThan": "cccce3190ba4356432b9f22369b56123d3d89f0d",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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},
{
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},
{
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},
{
"lessThan": "38bcc21f52246badb3154b6158dcb381d98de011",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
}
]
},
{
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"product": "Linux",
"programFiles": [
"net/core/rtnetlink.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.88",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.30",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.258",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.209",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.175",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.140",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.88",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.30",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.7",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1-rc3",
"versionStartIncluding": "5.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo\n\nrtnl_fill_vfinfo() declares struct ifla_vf_broadcast on the stack\nwithout initialisation:\n\n\tstruct ifla_vf_broadcast vf_broadcast;\n\nThe struct contains a single fixed 32-byte field:\n\n\t/* include/uapi/linux/if_link.h */\n\tstruct ifla_vf_broadcast {\n\t\t__u8 broadcast[32];\n\t};\n\nThe function then copies dev->broadcast into it using dev->addr_len\nas the length:\n\n\tmemcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);\n\nOn Ethernet devices (the overwhelming majority of SR-IOV NICs)\ndev->addr_len is 6, so only the first 6 bytes of broadcast[] are\nwritten. The remaining 26 bytes retain whatever was previously on\nthe kernel stack. The full struct is then handed to userspace via:\n\n\tnla_put(skb, IFLA_VF_BROADCAST,\n\t\tsizeof(vf_broadcast), &vf_broadcast)\n\nleaking up to 26 bytes of uninitialised kernel stack per VF per\nRTM_GETLINK request, repeatable.\n\nThe other vf_* structs in the same function are explicitly zeroed\nfor exactly this reason - see the memset() calls for ivi,\nvf_vlan_info, node_guid and port_guid a few lines above.\nvf_broadcast was simply missed when it was added.\n\nReachability: any unprivileged local process can open AF_NETLINK /\nNETLINK_ROUTE without capabilities and send RTM_GETLINK with an\nIFLA_EXT_MASK attribute carrying RTEXT_FILTER_VF. The kernel walks\neach VF and emits IFLA_VF_BROADCAST, leaking 26 bytes of stack per\nVF per request. Stack residue at this call site can include return\naddresses and transient sensitive data; KASAN with stack\ninstrumentation, or KMSAN, will flag the nla_put() when reproduced.\n\nZero the on-stack struct before the partial memcpy, matching the\nexisting pattern used for the other vf_* structs in the same\nfunction."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-01T16:18:55.372Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/14271b401ec6a4bf0d88054106fc2956084717e1"
},
{
"url": "https://git.kernel.org/stable/c/cccce3190ba4356432b9f22369b56123d3d89f0d"
},
{
"url": "https://git.kernel.org/stable/c/a44fbb631cba646532f3948636626f81717365a7"
},
{
"url": "https://git.kernel.org/stable/c/0653c0516234c8258975d268a749115fc0f0ff00"
},
{
"url": "https://git.kernel.org/stable/c/c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8"
},
{
"url": "https://git.kernel.org/stable/c/fbe0e6197225e6a83cf113a67a4b425f8de0bcd5"
},
{
"url": "https://git.kernel.org/stable/c/38bcc21f52246badb3154b6158dcb381d98de011"
},
{
"url": "https://git.kernel.org/stable/c/4b9e327991815e128ad3af75c3a04630a63ce3e0"
}
],
"title": "net: rtnetlink: zero ifla_vf_broadcast to avoid stack infoleak in rtnl_fill_vfinfo",
"x_generator": {
"engine": "bippy-1.2.0"
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},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-46132",
"datePublished": "2026-05-28T09:35:47.047Z",
"dateReserved": "2026-05-13T15:03:33.099Z",
"dateUpdated": "2026-06-01T16:18:55.372Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}