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VulnerabilityPublished Updated

CVE-2026-80893: Linux kernel · mm/hugetlb: fix swap entry corruption when clearing uffd-wp at fork()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f1b1311c0352873137768bac5a126e491271a747 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:33 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 f1b1311c0352873137768bac5a126e491271a747, 83abe2fd5b3aeb3123b5408a5a91709c5538fb23, 69cb5825d9988c7944bc9f1dc08cb233655405a7 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 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
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < f1b1311c0352873137768bac5a126e491271a747
Fixed in
  • f1b1311c0352873137768bac5a126e491271a747
LinuxLinuxAffected
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < 83abe2fd5b3aeb3123b5408a5a91709c5538fb23
Fixed in
  • 83abe2fd5b3aeb3123b5408a5a91709c5538fb23
LinuxLinuxAffected
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < 69cb5825d9988c7944bc9f1dc08cb233655405a7
Fixed in
  • 69cb5825d9988c7944bc9f1dc08cb233655405a7
LinuxLinuxAffected
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < 8b0de7005b148738d79d6c45594d566489948a68
Fixed in
  • 8b0de7005b148738d79d6c45594d566489948a68
LinuxLinuxAffected
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < 2fa11c60c9c06bafc19cf4d9efdaa36a38079e87
Fixed in
  • 2fa11c60c9c06bafc19cf4d9efdaa36a38079e87
LinuxLinuxAffected
  • ≥ bc70fbf269fdff410b0b6d75c3770b9f59117b90, < 2b9a07002c2f296aa6a9c591213933d3492e3089
Fixed in
  • 2b9a07002c2f296aa6a9c591213933d3492e3089

AI-suggested

A fix for this vulnerability has been implemented in multiple Linux kernel commits following version 5.19. Users and administrators should update to a Linux kernel version that includes these fixes. No additional mitigation actions are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's hugetlb memory management subsystem causes swap entry corruption during fork() when clearing the uffd-wp bit improperly. This occurs because the clearing function targets the wrong bit position in swap entries, leading to an incorrect page frame number encoding in the child process. The issue affects version 5.19 and has been fixed in subsequent commits.

References

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