High 8.4Published Apr 21, 2026

CVE-2026-5398Kernel use-after-free bug in the TIOCNOTTY handler

Updated under an hour ago (Oct 26, 2026, 1:30 PM ET)

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It affects FreeBSD. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.4 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: freebsd
NVD analysis: Analyzed
Record last updated: Apr 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeBSD FreeBSD freebsd:freebsd (from the name)	from 15.0-RELEASE before p6; from 14.4-RELEASE before p2; from 14.3-RELEASE before p11; from 13.5-RELEASE before p12	CNA record
freebsd freebsd freebsd:freebsd	13.5; 13.5; 13.5; 13.5; 13.5; 13.5; 13.5; 13.5; and 25 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.