CVE-2026-64375: proc: protect ptrace_may_access() with exec_update_lock (FD links)

CSIRTS triage

What

The vulnerability protects ptrace_may_access() with exec_update_lock to prevent issues with FD links.

Who is affected

Deployments using the proc subsystem.

Urgency

Remediation is necessary to ensure security, with no known exploits.

Action

Implement the protection for ptrace_may_access() with exec_update_lock.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

high — CVSS 7.1

Published

2026-07-14

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64375

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-2026-643750.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownDSA-6405-1 linux - security updatedebian
• highCVE-2026-64375: In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_a…nvd

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