CVE-2026-31466: Linux kernel · mm/huge_memory: fix folio isn't locked in softleaf_to_folio()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f1acf5887c2bbaf998dc3fe32c72b7a8b84a3ddd : patch Linux kernel soon.
Data as of 5 Nov 2026, 22:32 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
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, 2026-11-05.
- Patch
- Available – fixed in f1acf5887c2bbaf998dc3fe32c72b7a8b84a3ddd, b8c49ad888892ad7b77062b9c102b799a3e9b4f8, 722cfaf6b31d31123439e67b5deac6b1261a3dea +5
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 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 5 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 for this vulnerability is available and has been merged into Linux kernel version 4.5 and later. Users and administrators should update to a patched kernel version to remediate this issue. No additional mitigation steps are required beyond applying the official fix.
Description
CVE-2026-31466 is a race condition vulnerability in the Linux kernel's memory management subsystem on arm64 servers. It occurs due to a missing memory barrier in the softleaf_to_folio() function, which can cause a folio to be modified without holding the required folio lock. This issue triggers a kernel warning and could lead to unstable memory operations during transparent huge page splitting and page table entry updates. The vulnerability has been fixed in Linux kernel version 4.5 and later commits.
References
- git.kernel.org/stable/c/426ee10711586617da869c8bb798214965337617 (opens in a new tab)
- git.kernel.org/stable/c/f1acf5887c2bbaf998dc3fe32c72b7a8b84a3ddd (opens in a new tab)
- git.kernel.org/stable/c/722cfaf6b31d31123439e67b5deac6b1261a3dea (opens in a new tab)
- git.kernel.org/stable/c/7ddcf4a245c1c5a91fdd9698757e3d95179ffe41 (opens in a new tab)
- git.kernel.org/stable/c/b8c49ad888892ad7b77062b9c102b799a3e9b4f8 (opens in a new tab)
- git.kernel.org/stable/c/7ad1997b9bc8032603df8f091761114479285769 (opens in a new tab)
- git.kernel.org/stable/c/8bfb8414e9f2ce6f5f2f0e3d0da52f2d132128e7 (opens in a new tab)
- git.kernel.org/stable/c/4c5e7f0fcd592801c9cc18f29f80fbee84eb8669 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)