CVE-2026-5398

Kernel use-after-free bug in the TIOCNOTTY handler

HIGH

8.4

CVSS Score

Published: April 22, 2026 at 02:23 AM UTC

Updated: June 17, 2026 at 10:58 AM UTC

1 product affected across 1 vendorFreeBSD

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Severity

HIGH8.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FreeBSD · Freebsd

95%

13.5-RELEASE ≤ v < p1214.3-RELEASE ≤ v < p1114.4-RELEASE ≤ v < p215.0-RELEASE ≤ v < p613.5 13.5 beta3 13.5 p1 13.5 p10 13.5 p11 13.5 p2 13.5 p3 13.5 p4 13.5 p5 13.5 p6 13.5 p7 13.5 p8 13.5 p9 13.5-RELEASE 14.3 14.3 p1 14.3 p10 14.3 p2 14.3 p3 14.3 p4 14.3 p5 14.3 p6 14.3 p7 14.3 p8 14.3 p9 14.3-RELEASE 14.4 14.4 p114.4 rc114.4-RELEASE 15.0 15.0 p1 15.0 p2 15.0 p3 15.0 p4 15.0 p5 15.0-RELEASE

Affected range stops below p11, so it looks safe — our inference, not a vendor statement

Affected range stops below p12, so it looks safe — our inference, not a vendor statement

Affected range stops below p2, so it looks safe — our inference, not a vendor statement

Affected range stops below p6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

Vendor Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.4HIGHCISA-ADP

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-416

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