CVE-2026-23025

PCP corruption via interrupt-nested spin locking

Published Jan 31, 2026 · Updated Jan 31, 2026

Memory corruption in affected Linux kernel releases allows local users to corrupt per-CPU page state through interrupt-nested locking. In mm/page_alloc.c, drain_pages_zone() holds pcp->lock without disabling interrupts, while an interrupt can enter spin_trylock() on the same lock; an SMP-disabled build incorrectly assumes that trylock always succeeds. Exploitation requires a local low-privileged context and a kernel built with CONFIG_SMP disabled; lock debugging reports a failure, while an unchecked occurrence corrupts the PCP structure.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in affected Linux kernel releases allows local users to corrupt per-CPU page state through interrupt-nested locking. In mm/page_alloc.c, drain_pages_zone() holds pcp->lock without disabling interrupts, while an interrupt can enter spin_trylock() on the same lock; an SMP-disabled build incorrectly assumes that trylock always succeeds. Exploitation requires a local low-privileged context and a kernel built with CONFIG_SMP disabled; lock debugging reports a failure, while an unchecked occurrence corrupts the PCP structure.

The record

CVE
CVE-2026-23025
Published
Jan 31, 2026
Updated
Jan 31, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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=5749077415994eb02d660b2559b9d8278521e73d <038a102535eb49e10e93eafac54352fcc5d78847
  2. Affected versionversion=5749077415994eb02d660b2559b9d8278521e73d <3098f8f7c7b0686c74827aec42a2c45e69801ff8
  3. Affected versionversion=5749077415994eb02d660b2559b9d8278521e73d <4a04ff9cd816e7346fcc8126f00ed80481f6569d
  4. Affected versionversion=5749077415994eb02d660b2559b9d8278521e73d <df63d31e9ae02e2f6cd96147779e4ed7cd0e75f6
  5. Affected versionversion=6.2
  6. Affected versionversion=d1da921452b3ee7e07383c12955ab1c6f3b08752

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5749077415994eb02d660b2559b9d8278521e73d <038a102535eb49e10e93eafac54352fcc5d78847; version=5749077415994eb02d660b2559b9d8278521e73d <3098f8f7c7b0686c74827aec42a2c45e69801ff8; version=5749077415994eb02d660b2559b9d8278521e73d <4a04ff9cd816e7346fcc8126f00ed80481f6569d; version=5749077415994eb02d660b2559b9d8278521e73d <df63d31e9ae02e2f6cd96147779e4ed7cd0e75f6; version=6.2; version=d1da921452b3ee7e07383c12955ab1c6f3b08752

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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