CVE-2026-64111: lsm: hold cred_guard_mutex for lsm_set_self_attr()

criticalCVSS 9.8CVE-2026-64111

CSIRTS triage

Privilege escalation

What: This vulnerability allows for privilege escalation due to improper handling of the cred_guard_mutex.
Who is affected: Deployments using the affected kernel versions.
Urgency: Remediation is urgent due to the critical severity and potential for exploitation.
Action: Apply the latest kernel patches to mitigate this vulnerability.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64111

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-2026-641110.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64111	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 lsm

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-2026-64192: In the Linux kernel, the following vulnerability has been resolved: bpf: Reject BPF_MAP_TYPE_I…nvd · 2026-07-20
highCVE-2026-64111: In the Linux kernel, the following vulnerability has been resolved: lsm: hold cred_guard_mutex…nvd · 2026-07-19
highCVE-2026-63865: In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode an…nvd · 2026-07-19
highCVE-2026-64192: bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitializedmsrc · 2026-07-14