CVE-2026-49422

8.4 Élevée

Publiée le 19/08/2026 à 08:17 · Modifiée le 01/09/2026 à 22:20 · Analysée par le NVD · Source : secteam@freebsd.org

Description

The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock. After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block. If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory. The bug may be exploitable by an unprivileged local user to escalate privileges.

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Produits concernés

FreeBSD
Freebsd freebsd

Scores CVSS

Version	Score	Source	Vecteur
3.1	8.4 Élevée	134c704f-9b21-4f2e-91b3-4a467353bcc0	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Faiblesses (CWE)

CWE-416

Références

https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.asc Vendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories