CVE-2026-49427: Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an…
CVE-2026-49427 · Severity: high · CVSS 8.8 · Published 2026-08-19
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-49427 being exploited in the wild.
How severe is CVE-2026-49427?
High severity, with a CVSS score of 8.8, published 19 August 2026.
Which products and versions are affected?
Freebsd. The advisory does not name versions.
Is there a fix for CVE-2026-49427?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-49427?
Check whether you run Freebsd. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.