CVE-2026-64560Public exploitHinoki check available

Kernel memory corruption via CPU-timer exec race

Published Jul 29, 2026 · Updated Jul 29, 2026

Use-after-free in Linux kernel POSIX CPU timers allows local users to corrupt kernel memory by racing timer deletion with non-leader exec(). The deletion path frees an armed TGID-targeted POSIX timer after lock_task_sighand() follows the old group leader, leaving its timerqueue node enqueued and later dereferenced. A local process must win the race while the timer is armed and enqueued; subsequent timer processing can corrupt kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux kernel POSIX CPU timers allows local users to corrupt kernel memory by racing timer deletion with non-leader exec(). The deletion path frees an armed TGID-targeted POSIX timer after lock_task_sighand() follows the old group leader, leaving its timerqueue node enqueued and later dereferenced. A local process must win the race while the timer is armed and enqueued; subsequent timer processing can corrupt kernel memory or crash the system.

The record

CVE
CVE-2026-64560
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 <920f893f735e92ba3a1cd9256899a186b161928d
  2. Affected versionversion=55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 <ad1cafa1bdaa71da85d71cac053838bbe97852b6
  3. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 <920f893f735e92ba3a1cd9256899a186b161928d; version=55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59 <ad1cafa1bdaa71da85d71cac053838bbe97852b6; version=5.7

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8GitHubCVSS:3.1/AV:L/AC:L/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 exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

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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