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VulnerabilityPublished Updated

CVE-2026-74399: Linux kernel · evm: terminate and bound the evm_xattrs read buffer

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in a36cbfb85f26e6c6fb6529b1a364331b94dc88f3 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 18:03 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in a36cbfb85f26e6c6fb6529b1a364331b94dc88f3, a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d, 11143a19f5b8dc8f414deab87571134f9f447313 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < a36cbfb85f26e6c6fb6529b1a364331b94dc88f3
Fixed in
  • a36cbfb85f26e6c6fb6529b1a364331b94dc88f3
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d
Fixed in
  • a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 11143a19f5b8dc8f414deab87571134f9f447313
Fixed in
  • 11143a19f5b8dc8f414deab87571134f9f447313
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 38b7d63b23aa9d2ddde7688040e9426d32be4065
Fixed in
  • 38b7d63b23aa9d2ddde7688040e9426d32be4065
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 12ad52dc45a0c8c9d25e85b4a84201de4c5420ed
Fixed in
  • 12ad52dc45a0c8c9d25e85b4a84201de4c5420ed
LinuxLinuxAffected
  • ≥ fa516b66a1bfce1d72f1620c54bdfebc493000d1, < 8df81954d22a653a8b01d46692cd56f71137269b
Fixed in
  • 8df81954d22a653a8b01d46692cd56f71137269b

AI-suggested

A fix is available in the Linux kernel commits identified by the provided fixedVersions hashes. Users should update their Linux kernel to a version containing these fixes to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's evm subsystem was fixed by properly terminating and bounding the evm_xattrs read buffer. The flaw involved reading beyond initialized memory when no extended attributes were enabled, due to an uninitialized buffer and incorrect length calculation.

References

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