CVE-2026-64419: mm/shrinker: do not hold RCU lock in shrinker_debugfs_count_show()

highCVSS 7.1CVE-2026-64419

CSIRTS triage

Other

What: There is a potential issue with holding RCU lock in shrinker_debugfs_count_show().
Who is affected: Users of the mm/shrinker component.
Urgency: Remediation urgency is unclear due to unknown severity.
Action: Monitor for updates regarding this issue.

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-2026-64419

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-2026-644190.17% 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-2026-64419	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownCVE-2026-64419: In the Linux kernel, the following vulnerability has been resolved: mm/shrinker: do not hold R…nvd

Recent advisories for mm/shrinker

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-2026-64419: In the Linux kernel, the following vulnerability has been resolved: mm/shrinker: do not hold R…nvd · 2026-07-25