CVE-2026-43393
📛 CVE Title
btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()
Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies() Fix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL, we're not freeing the chunk map that we've just looked up.
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
- CWE(s)
- —
- Reserved
- 2026-05-01
- Published
- 2026-05-08 16:21 UTC
- Last updated
- 2026-05-12 00:23 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43393.json
- Linked Threat
- CVE-2026-43393 — CVE-2026-43393
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
- 2026-05-08 15:16:50 UTC
- NVD last modified
- 2026-05-12 14:10:27 UTC
- EPSS score
- 0.0002 (probability of exploitation in next 30 days)
- EPSS percentile
- 6.85% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 08:56 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-2026-28699 - Assigner
- Linux
- Published
- May 8, 2026, 2:21:37 PM
- Updated
- May 11, 2026, 10:23:43 PM
- EUVD base score
- 0.0 / 10
- EUVD-reported EPSS
- 0.0100
- Vendors
- Linux
- Products
-
Linux (patch: 0)Linux (0ae653fbec2b9fbc72c65a0c99528990bfb2136d <0e4aaf5a3212b6a469c2489637c29a8e2a5062a5)Linux (patch: 6.12.78)Linux (patch: 6.19.9)Linux (patch: 7.0)Linux (0ae653fbec2b9fbc72c65a0c99528990bfb2136d <7bdf00ed75c477252578068dba19934cd825f20a)Linux (0ae653fbec2b9fbc72c65a0c99528990bfb2136d <f15fb3d41543244d1179f423da4a4832a55bc050)Linux (patch: 6.18.19)Linux (6.12)Linux (0ae653fbec2b9fbc72c65a0c99528990bfb2136d <4f90c5c2698383984102401b1724b0b67da832ab)
ENISA description: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies() Fix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL, we're not freeing the chunk map that we've just looked up.
EUVD references (4)
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Linux | Linux |
0ae653fbec2b9fbc72c65a0c99528990bfb2136d (affected),
0ae653fbec2b9fbc72c65a0c99528990bfb2136d (affected),
0ae653fbec2b9fbc72c65a0c99528990bfb2136d (affected),
0ae653fbec2b9fbc72c65a0c99528990bfb2136d (affected)
|
— |
| Linux | Linux |
6.12 (affected),
0 (unaffected),
6.12.78 (unaffected),
6.18.19 (unaffected),
6.19.9 (unaffected),
7.0 (unaffected)
|
— |
Vendor references (4)
References embedded in the original CVE record by the assigning CNA.
MITRE references (4) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
Web references (3)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2026-43393 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-43393 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (4)
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/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remediations (18)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-23 21:05 UTC -
web:docs.oracle.com
Oracle Critical Patch Update (CPU) April 2026 for Oracle Java SE Services: Java Management Release Date: April 21, 2026
2026-05-23 21:05 UTC -
web:heimdalsecurity.com
Explore six essential patch management best practices for 2026 to keep your systems secure, up to date, and protected from vulnerabilities.
2026-05-23 21:05 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 21:05 UTC -
web:nvd.nist.gov
Official websites use .gov A .gov website belongs to an official government organization in the United States.
2026-05-23 21:05 UTC -
web:oracle-base.com
The OPatch utility doesn't let you re-apply a patch already present, so it's quite easy to simplify the process by having a very similar process each quarter. Once I've got all the patches, I write a patching script for each product. For the database this includes OPatch and the latest database patches.
2026-05-23 21:05 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.
2026-05-23 21:05 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.
2026-05-23 21:05 UTC -
web:www.securityweek.com
Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.
2026-05-23 21:05 UTC -
web:www.windowslatest.com
Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.
2026-05-23 21:05 UTC -
web:blog.qualys.com
Oracle released its second quarterly edition of this year's Critical Patch Update. The update received patches for 481 security vulnerabilities.
2026-05-26 02:47 UTC -
web:community.ui.com
Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...
2026-05-26 02:47 UTC -
web:krebsonsecurity.com
For a clickable, per- patch breakdown, check out the SANS Internet Storm Center Patch Tuesday roundup. Running into problems applying any of these updates?
2026-05-26 02:47 UTC -
web:msrc.microsoft.com
The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.
2026-05-26 02:47 UTC -
web:windowsforum.com
Microsoft has published CVE - 2026 -42833 as a Microsoft Dynamics 365 On-Premises remote code execution vulnerability in the Security Update Guide, and as of May 12, 2026 , the most important operational fact is that Microsoft—not merely a third-party scanner or rumor feed—is treating it as a real...
2026-05-26 02:47 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.
2026-05-26 02:47 UTC -
web:www.tenable.com
Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.
2026-05-26 02:47 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-26 02:47 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-43393.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/btrfs/volumes.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "0e4aaf5a3212b6a469c2489637c29a8e2a5062a5",
"status": "affected",
"version": "0ae653fbec2b9fbc72c65a0c99528990bfb2136d",
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{
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},
{
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"status": "affected",
"version": "0ae653fbec2b9fbc72c65a0c99528990bfb2136d",
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},
{
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"status": "affected",
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
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"programFiles": [
"fs/btrfs/volumes.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"lessThan": "6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()\n\nFix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL,\nwe're not freeing the chunk map that we've just looked up."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T22:23:43.050Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5"
},
{
"url": "https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a"
},
{
"url": "https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab"
},
{
"url": "https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050"
}
],
"title": "btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-43393",
"datePublished": "2026-05-08T14:21:37.368Z",
"dateReserved": "2026-05-01T14:12:56.007Z",
"dateUpdated": "2026-05-11T22:23:43.050Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}