CVE-2026-23100

Availability loss via missed shared PMD detection

Published Feb 4, 2026 · Updated Feb 4, 2026

PMD-sharing detection failure in Linux Kernel 6.13 and affected stable branches allows local users to cause availability loss via page migration. The hugetlb_pmd_shared function checks a page-table refcount that no longer tracks sharing, so migration proceeds on nonexclusive folios and pagemap marks shared mappings exclusive. Exploitation requires local access, shared hugetlb PMD tables, and a page-migration path; public records do not identify the exact availability failure mode.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PMD-sharing detection failure in Linux Kernel 6.13 and affected stable branches allows local users to cause availability loss via page migration. The hugetlb_pmd_shared function checks a page-table refcount that no longer tracks sharing, so migration proceeds on nonexclusive folios and pagemap marks shared mappings exclusive. Exploitation requires local access, shared hugetlb PMD tables, and a page-migration path; public records do not identify the exact availability failure mode.

The record

CVE
CVE-2026-23100
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=02333ac1c35370517a19a4a131332a9690c6a5c7
  2. Affected versionversion=2e31443a0d18ae43b9d29e02bf0563f07772193d
  3. Affected versionversion=56b274473d6e7e7375f2d0a2b4aca11d67c6b52f
  4. Affected versionversion=59d9094df3d79443937add8700b2ef1a866b1081 <69c4e241ff13545d410a8b2a688c932182a858bf
  5. Affected versionversion=59d9094df3d79443937add8700b2ef1a866b1081 <ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216
  6. Affected versionversion=6.13
  7. Affected versionversion=8410996eb6fea116fe1483ed977aacf580eee7b4
  8. Affected versionversion=94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=02333ac1c35370517a19a4a131332a9690c6a5c7; version=2e31443a0d18ae43b9d29e02bf0563f07772193d; version=56b274473d6e7e7375f2d0a2b4aca11d67c6b52f; version=59d9094df3d79443937add8700b2ef1a866b1081 <69c4e241ff13545d410a8b2a688c932182a858bf; version=59d9094df3d79443937add8700b2ef1a866b1081 <ca1a47cd3f5f4c46ca188b1c9a27af87d1ab2216; version=6.13; version=8410996eb6fea116fe1483ed977aacf580eee7b4; version=94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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