CVE-2026-58090

The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket buffer before processing them. Some error paths would free those messages, leaving freed data mbufs in the receive socket buffer. An unprivileged local user can exploit this use-after-free to escalate privileges.

Score

CVSS 3.1 7.8 High

Status

Analyzed - secteam@freebsd.org

Published

2026-08-26

Last modified

2026-08-27

Weaknesses

CWE-416

Affected products

• Freebsd (Freebsd)

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:57.unix.asc