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VulnerabilityPublished Updated

CVE-2026-23100: Linux kernel · mm/hugetlb: fix hugetlb_pmd_shared()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:03 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216, bf3c2affe245cf831866ddc8f736ae6a22cdc11c, 69c4e241ff13545d410a8b2a688c932182a858bf +9

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Feb 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 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=5.10.239 <5.10.253
  • >=5.15.186 <5.15.203
  • >=6.1.142 <6.1.167
  • >=6.6.72 <6.6.127
  • >=6.12.9 <6.12.74
Fixed in
  • ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216
  • bf3c2affe245cf831866ddc8f736ae6a22cdc11c
  • 69c4e241ff13545d410a8b2a688c932182a858bf
  • 51dcf459845fd28f5a0d83d408a379b274ec5cc5
  • 8ae48255bcb17b32436be97553dca848730d365f
  • 6.12.74
  • 6.6.127
  • 6.1.167
  • 5b2aec77f92265a9028c5f632bdd9af5b57ec3a3
  • 5.15.203
  • 5.10.253
  • 3a18b452dd5f7f1652c2e92f8ae769aa17a66c9e
LinuxLinuxAffected
  • =6.13
Fixed in–

AI-suggested

Fixed versions are available and should be applied. The patches have been merged into Linux kernel versions 5.10.253, 5.15.203, 6.1.167, 6.6.127, and 6.12.74, among others. Users and administrators should upgrade to these or later kernel versions to resolve the issue. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's hugetlb subsystem was fixed by correcting the hugetlb_pmd_shared() function. The flaw caused incorrect detection of shared PMD tables, leading to improper handling of page migration and memory accounting. The fix involves using an independent shared count to identify shared page tables correctly, addressing both functional and performance issues.

References

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