CVE-2026-49427

EUVD-2026-62254
Pages belonging to largepage shared memory objects were not explicitly wired.  When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.

An unprivileged local user can abuse the bug to access freed kernel memory.  This can be exploited to escalate privileges.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
UNKNOWN
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 27.06%
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc