CVE-2026-5398

Description

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.

PUBLISHED Reserved 2026-04-02 | Published 2026-04-22 | Updated 2026-04-22 | Assigner freebsd

Problem types

CWE-416: Use After Free

Product status

Credits

Nicholas Carlini using Claude, Anthropic finder

References

security.freebsd.org/advisories/FreeBSD-SA-26:10.tty.asc vendor-advisory

cve.org (CVE-2026-5398)

nvd.nist.gov (CVE-2026-5398)

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