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

CVE-2026-64560 is a vulnerability in posix-cpu-timers: Prevent UAF caused by non-leader exec() race, rated Important by Microsoft, with a CVSS 3.1 base score of 7 (High). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.66% probability of exploitation activity in the next 30 days, higher than 52% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).

Key facts

CVE ID
CVE-2026-64560
Severity
High CVSS 7
Microsoft severity
Important
Exploited in the wild
No
Publicly disclosed
No
Weakness
CWE-416; CWE-362
EPSS
0.66% (percentile 52%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
July 2026 Patch Tuesday
Product families
Open Source Software

CVSS score and vector

Microsoft scores CVE-2026-64560 at 7 (temporal 7) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

MetricValue
Attack vectorLocal
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh

NVD scores it 7.8 (HIGH) with CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products (1)

Open Source Software

ProductSecurity updateTypeFixed buildRestart
azl3 kernel 6.6.145.2-1 on Azure Linux 3.0CBL-Mariner ReleasesSecurity Update6.6.150.1-1No

Exploitation and detection

Detection and weaponization

Weaponization maturity: Exploit.

Proof-of-concept repositories (23)

NIST NVD data

NVD status
Analyzed
NVD CVSS
7.8 (HIGH)
NVD weakness
CWE-416; CWE-362
Published to NVD
NVD last modified

Affected configurations (CPE)

ProductVulnerable versions
linux kernelfrom 5.7, before 5.10.262
linux kernelfrom 5.11, before 5.15.213
linux kernelfrom 5.16, before 6.1.180
linux kernelfrom 6.2, before 6.6.147
linux kernelfrom 6.7, before 6.12.100
linux kernelfrom 6.13, before 6.18.41
linux kernelfrom 6.19, before 7.1.5
linux kernel 7.2all listed versions
linux kernel 7.2all listed versions

References

Revision history

VersionDateDescription
1.0Information published.
2.0Information published.

Sources