CVE-2026-74722: Linux kernel · btrfs: fix memory leak in btrfs_do_encoded_write()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:48 UTC
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
Disclosed: evidence found.
CVE published 22 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0 (opens in a new tab)
- git.kernel.org/stable/c/e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47 (opens in a new tab)
- git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31 (opens in a new tab)
- git.kernel.org/stable/c/24a8f2c29aebb753ccb962fbb25bae18d7978f6e (opens in a new tab)
- git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64 (opens in a new tab)
- git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632 (opens in a new tab)