PT-2026-34241 · Freebsd · Freebsd

Nicholas Carlini · Published 2026-04-22 · Updated 2026-05-01 · CVE-2026-5398

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions The product name cannot be determined (affected versions not specified)

Description The implementation of TIOCNOTTY fails to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process exits, the terminal structure may retain a pointer to freed memory, creating a dangling pointer. A malicious process can exploit this condition to obtain root privileges.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-5398

Affected Products

Freebsd

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-5398 · Security Note
• https://security.freebsd.org/advisories/FreeBSD-SA-26:10.tty.asc · Vendor Advisory
• https://twitter.com/CVEnew/status/2048168387524886757 · Twitter Post
• https://freebsd.org/security/advisories/FreeBSD-SA-26:10.tty.asc · Note
• https://reddit.com/r/freebsd/comments/1svvco2/freebsd_security_patches_for_two_more_claude · Reddit Post
• https://t.me/cveNotify/161717 · Telegram Post