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VulnerabilityPublished Updated

CVE-2026-74722: Linux kernel · btrfs: fix memory leak in btrfs_do_encoded_write()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:48 UTC

Severity
Low

Rated Low 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 e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47, d2a4e4e626b2f4670b69b430c357f03f53eb6632, 60b50ceba6243802f8d2c0a9a7c2d549a93b1d64 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 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
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47
Fixed in
  • e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47
LinuxLinuxAffected
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < d2a4e4e626b2f4670b69b430c357f03f53eb6632
Fixed in
  • d2a4e4e626b2f4670b69b430c357f03f53eb6632
LinuxLinuxAffected
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < 60b50ceba6243802f8d2c0a9a7c2d549a93b1d64
Fixed in
  • 60b50ceba6243802f8d2c0a9a7c2d549a93b1d64
LinuxLinuxAffected
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < 24a8f2c29aebb753ccb962fbb25bae18d7978f6e
Fixed in
  • 24a8f2c29aebb753ccb962fbb25bae18d7978f6e
LinuxLinuxAffected
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < 20c0eeb4313f9f89d47b80b672b5846f9827cb31
Fixed in
  • 20c0eeb4313f9f89d47b80b672b5846f9827cb31
LinuxLinuxAffected
  • ≥ 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22, < 0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0
Fixed in
  • 0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0

AI-suggested

A fix is available and has been applied in specific commits to the Linux kernel source. Users and administrators should update to a Linux kernel version that includes these fixes to remediate the memory leak. No additional mitigation actions are indicated or required beyond applying the official patch.

Description

A memory leak vulnerability was identified and fixed in the Linux kernel's Btrfs filesystem code, specifically in the function btrfs_do_encoded_write(). The issue was discovered through local fuzzing of version 6.12.94 and involves unreferenced memory objects not being freed properly. The fix involves freeing an extent changeset before returning from the affected function to prevent the leak.

References

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