CVE-2026-49427

8.8 highEPSS 0.5%

High (8.8) in freebsd freebsd. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-826
Published: 2026-08-19
Modified: 2026-09-01
Record from: the NVD, synced 2026-10-19

Affected

freebsd:freebsd

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc

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