CVE-2026-45838

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

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: 2026-05-27 09:24 UTC
Last updated: 2026-06-01 16:16 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45838.json
Linked Threat: CVE-2026-45838 — CVE-2026-45838

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: 2026-05-27 11:16:23 UTC
NVD last modified: 2026-06-26 19:09:03 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: 2.71% vs all CVEs — higher = more likely to be exploited, as of 2026-07-26

NVD-assigned CWE(s): CWE-476 (differs from the CNA list above)

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-2026-32164
Assigner: Linux
Published: May 27, 2026, 9:24:36 AM
Updated: Jun 14, 2026, 5:46:05 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.1300
Vendors: Linux
Products: Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <32ce55d424395904986f5066f8755f6cb9993377)

Linux (patch: 6.18.33)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <85a2f30e40f7468db732f55659bc6318874f49af)

Linux (patch: 6.12.91)

Linux (patch: 0)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <26d3339e465e54107bd85884341d1609c5300d6a)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <fc39753b7f92e09177777e9c648afe5aa3abb81f)

Linux (patch: 6.1.175)

Linux (patch: 5.15.209)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <b4b5a20bed82130da2f2818f04d52378952fbd0b)

Linux (4.19)

Linux (patch: 6.6.141)

Linux (patch: 7.1)

Linux (patch: 5.10.258)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <2c88b2d96e1d4d0c7c4589a4593d4cdee6d332d6)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <5828b9e5b272ecff7cf5d345128d3de7324117f7)

Linux (patch: 7.0.10)

Linux (de9cbbaadba5adf88a19e46df61f7054000838f6 <0f3d9dd5e1fd52b39e25328307c6a694e994ffe3)
Aliases: GHSA-x78h-gf69-p5j6

ENISA description: In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

EUVD references (8)

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 2026-09-25 03:07 UTC (source: CVRF).

MS severity: Moderate
MS CVSS base score: 5.5 / 10 (temporal 5.5)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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	`de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected), `de9cbbaadba5adf88a19e46df61f7054000838f6` (affected)	—
Linux	Linux	`4.19` (affected), `0` (unaffected), `5.10.258` (unaffected), `5.15.209` (unaffected), `6.1.175` (unaffected), `6.6.141` (unaffected), `6.12.91` (unaffected), `6.18.33` (unaffected), `7.0.10` (unaffected), `7.1-rc1` (unaffected)	—

Affected products — CPE 2.3 (1) 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:*:*:*:*:*:*:*:*

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

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-2026-45838 msrc
None Available msrc
https://git.kernel.org/stable/c/2c88b2d96e1d4d0c7c4589a4593d4cdee6d332d6 tenable:git.kernel.org
https://git.kernel.org/stable/c/32ce55d424395904986f5066f8755f6cb9993377 tenable:git.kernel.org
https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7 tenable:git.kernel.org
https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af tenable:git.kernel.org
https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b tenable:git.kernel.org
https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-45838 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-45838 tenable:www.cve.org
https://git.kernel.org/stable/c/0f3d9dd5e1fd52b39e25328307c6a694e994ffe3 tenable:git.kernel.org
https://www.first.org/epss/ tenable:www.first.org
https://git.kernel.org/stable/c/26d3339e465e54107bd85884341d1609c5300d6a 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/0f3d9dd5e1fd52b39e25328307c6a694e994ffe3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/26d3339e465e54107bd85884341d1609c5300d6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/2c88b2d96e1d4d0c7c4589a4593d4cdee6d332d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/32ce55d424395904986f5066f8755f6cb9993377 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch

Remediations (18)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

cve-details - Red Hat Customer Portal

web:access.redhat.com

We're sorry but cve -details doesn't work properly without JavaScript enabled. Please enable it to continue. LinkedInYouTubeFacebookX, formerly Twitter

2026-06-04 00:17 UTC
Microsoft and Adobe Patch Tuesday, May 2026 Security Update Review

web:blog.qualys.com

May 2026's Patch Tuesday arrives with Microsoft addressing a fresh set of vulnerabilities across its ecosystem, reinforcing the ongoing need for timely patching in an increasingly threat-heavy…

2026-06-04 00:17 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

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 00:17 UTC
VMware ESXi 8.0 Patch History

web:esxi-patches.v-front.de

Imageprofile ESXi-8.0U3j-25429389-standard (Build 25429389) includes the following updated VIBs:

2026-06-04 00:17 UTC
Patch Tuesday, May 2026 Edition - Krebs on Security

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.

2026-06-04 00:17 UTC
Security Update Guide - Microsoft

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 00:17 UTC
Portal for ArcGIS Security 2026 Update 1 Patch - Esri Support

web:support.esri.com

The C version of this patch also includes additional bug fixes not related to security, refer to the updated Issues Addressed with this Patch section for the latest details. April 20, 2026 : The 11.4 version of the Portal for ArcGIS Security 2026 Update 1 Patch is now available.

2026-06-04 00:17 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

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 00:17 UTC
Oracle Critical Patch Update Advisory - April 2026

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 00:17 UTC
Patch Tuesday June 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-06-04 00:17 UTC
Microsoft Confirms Defender RoguePlanet 0-Day Exploit and Working to ...

web:cybersecuritynews.com

Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed "RoguePlanet," and confirmed it is actively developing a security patch to address the flaw.

2026-06-19 02:26 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-06-19 02:26 UTC
Nvd - Cve-2026-53838

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-06-19 02:26 UTC
SAP Security Patch Day - February 2026

web:support.sap.com

SAP security Patch Day Bulletin

2026-06-19 02:26 UTC
CVE-2026-45583 Exchange RCE: Patch, Verify, and Reduce Internet ...

web:windowsforum.com

For CVE - 2026 -45583, administrators should verify the status of Exchange health tooling, mitigation services, and update readiness rather than assuming protection exists because a feature name sounds reassuring.

2026-06-19 02:26 UTC
Microsoft working on a fix for RoguePlanet, a flaw that grants full PC ...

web:www.malwarebytes.com

Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.

2026-06-19 02:26 UTC
Oracle Critical Security Patch Update Advisory - May 2026

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.

2026-06-19 02:26 UTC
Patch Tuesday - June 2026 - Rapid7

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 02:26 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45838.json.

{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/local_storage.c"
          ],
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            },
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            },
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            },
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            },
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            },
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              "status": "unaffected",
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            }
          ]
        }
      ],
      "cpeApplicability": [
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                },
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                }
              ],
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              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix end-of-list detection in cgroup_storage_get_next_key()\n\nlist_next_entry() never returns NULL -- when the current element is the\nlast entry it wraps to the list head via container_of(). The subsequent\nNULL check is therefore dead code and get_next_key() never returns\n-ENOENT for the last element, instead reading storage->key from a bogus\npointer that aliases internal map fields and copying the result to\nuserspace.\n\nReplace it with list_entry_is_head() so the function correctly returns\n-ENOENT when there are no more entries."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:16:20.101Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/26d3339e465e54107bd85884341d1609c5300d6a"
        },
        {
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        },
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          "url": "https://git.kernel.org/stable/c/b4b5a20bed82130da2f2818f04d52378952fbd0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/85a2f30e40f7468db732f55659bc6318874f49af"
        },
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        },
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          "url": "https://git.kernel.org/stable/c/fc39753b7f92e09177777e9c648afe5aa3abb81f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5828b9e5b272ecff7cf5d345128d3de7324117f7"
        }
      ],
      "title": "bpf: fix end-of-list detection in cgroup_storage_get_next_key()",
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        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45838",
    "datePublished": "2026-05-27T09:24:36.561Z",
    "dateReserved": "2026-05-13T15:03:33.077Z",
    "dateUpdated": "2026-06-01T16:16:20.101Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}