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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-49427

posixshm: largepage shared memory objects not explicitly wired

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Status
Published
Published
Updated
Assigning organization
freebsd

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

FreeBSD FreeBSD

Default version status: unknown

  • 15.1-RELEASE to < p1affected
  • 15.0-RELEASE to < p11affected
  • 14.4-RELEASE to < p7affected
  • 14.3-RELEASE to < p16affected

References