CVE-2026-64560: posix-cpu-timers: Prevent UAF caused by non-leader exec() race

highpublic exploitCVSS 7CVE-2026-64560

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption Privilege escalation

What: A use-after-free in posix-cpu-timers triggered by a race condition between non-leader process exec() and timer operations.
Who is affected: Multi-threaded processes on Linux systems using POSIX CPU timers with concurrent exec() calls.
Urgency: High severity (CVSS 7.0) with potential for privilege escalation or memory corruption; not currently exploited.
Action: Apply Linux kernel patch preventing race condition in posix-cpu-timers exec() handling.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64560

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-645600.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64560	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for posix-cpu-timers

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-64370: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error pathmsrc · 2026-08-06
highCVE-2026-64560: In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Prevent …nvd · 2026-07-29
unknownCVE-2026-64370: In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid …nvd · 2026-07-25