CVE-2026-64371: proc: protect ptrace_may_access() with exec_update_lock (part 1)

mediumCVSS 4.7CVE-2026-64371

CSIRTS triage

vendor: Linux product: ProcOther

What: The ptrace_may_access() function is not properly protected.
Who is affected: Deployments using the proc filesystem.
Urgency: Remediation is necessary to ensure proper access control, though no exploitation is reported.
Action: Apply the latest patches for the proc subsystem.

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: medium — CVSS 4.7
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64371

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-2026-643710.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64371	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 proc

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.

unknownCVE-2026-18187: A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability o…nvd · 2026-07-30
highCVE-2026-43818: An integer overflow was addressed with improved input validation. This issue is fixed in iOS 2…nvd · 2026-07-27
highCVE-2026-64468: In the Linux kernel, the following vulnerability has been resolved: binder: fix UAF in binder_…nvd · 2026-07-25
highCVE-2026-64375: In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_a…nvd · 2026-07-25
unknownCVE-2026-64371: In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_a…nvd · 2026-07-25
criticalCVE-2026-64268: In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: bound Read Respo…nvd · 2026-07-25