CVE-2026-23375

Kernel crash via anonymous-inode THP collapse

Published Mar 25, 2026 · Updated Mar 25, 2026

Denial of service in the Linux Kernel allows local users to crash the kernel through transparent huge-page collapse. file_thp_enabled() misclassifies guest_memfd and secretmem anonymous inodes as read-only regular files, allowing khugepaged or MADV_COLLAPSE to create unsupported large folios. The path requires CONFIG_READ_ONLY_THP_FOR_FS and local low-privileged access; guest_memfd reaches an unsupported-folio assertion, while upstream secretmem recovers and logs false memory-failure reports.

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

Denial of service in the Linux Kernel allows local users to crash the kernel through transparent huge-page collapse. file_thp_enabled() misclassifies guest_memfd and secretmem anonymous inodes as read-only regular files, allowing khugepaged or MADV_COLLAPSE to create unsupported large folios. The path requires CONFIG_READ_ONLY_THP_FOR_FS and local low-privileged access; guest_memfd reaches an unsupported-folio assertion, while upstream secretmem recovers and logs false memory-failure reports.

The record

CVE
CVE-2026-23375
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.8
  2. Affected versionversion=7fbb5e188248c50f737720825da1864ce42536d1 <0524ee56af2c9bfbad152a810f1ca95de8ca00d7
  3. Affected versionversion=7fbb5e188248c50f737720825da1864ce42536d1 <08de46a75f91a6661bc1ce0a93614f4bc313c581
  4. Affected versionversion=7fbb5e188248c50f737720825da1864ce42536d1 <dd085fe9a8ebfc5d10314c60452db38d2b75e609
  5. Affected versionversion=7fbb5e188248c50f737720825da1864ce42536d1 <f6fa05f0dddd387417d0c28281ddb951582514d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.8; version=7fbb5e188248c50f737720825da1864ce42536d1 <0524ee56af2c9bfbad152a810f1ca95de8ca00d7; version=7fbb5e188248c50f737720825da1864ce42536d1 <08de46a75f91a6661bc1ce0a93614f4bc313c581; version=7fbb5e188248c50f737720825da1864ce42536d1 <dd085fe9a8ebfc5d10314c60452db38d2b75e609; version=7fbb5e188248c50f737720825da1864ce42536d1 <f6fa05f0dddd387417d0c28281ddb951582514d6

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
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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