CVE-2026-64131: Linux kernel · mm/memory: fix spurious warning when unmapping device-private/exclusive pages
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e81446b559db4c98a6c2c5e039ac9cb23658432e : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:03 UTC
Rated Low 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, 2026-11-06.
- Patch
- Available – fixed in e81446b559db4c98a6c2c5e039ac9cb23658432e, e7af1b15c884ed12bb69da11aec095045d861ee8, be3f38d05cc5a7c3f13e51994c5dd043ab604d28 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 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 for this issue has been implemented in the Linux kernel as indicated by the fixed commit versions. Users should update to a Linux kernel version that includes these fixes to eliminate the spurious warnings. No additional mitigation actions are required.
Description
A Linux kernel vulnerability caused spurious warnings during unmapping of device-private or exclusive pages due to incorrect assumptions about anonymous memory mappings. The issue arises because the unmap path incorrectly uses vma_is_anonymous() to test conditions that should be tested with folio_test_anon(), leading to warnings during process teardown. This has been fixed in specific Linux kernel commits.
References
- git.kernel.org/stable/c/e81446b559db4c98a6c2c5e039ac9cb23658432e (opens in a new tab)
- git.kernel.org/stable/c/e7af1b15c884ed12bb69da11aec095045d861ee8 (opens in a new tab)
- git.kernel.org/stable/c/a825691b804b35141aaf4eac91003a70846e316d (opens in a new tab)
- git.kernel.org/stable/c/2fff0cdd942261497fb8922a194b4da3315ae864 (opens in a new tab)
- git.kernel.org/stable/c/52f72b3f8f6fa64abb71b711962b97f1f6aced1c (opens in a new tab)
- git.kernel.org/stable/c/be3f38d05cc5a7c3f13e51994c5dd043ab604d28 (opens in a new tab)