CVEvulnerability
CVE-2026-49422
8.4 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-08-19
- Last modified
- 2026-09-01
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 8.4 HIGH — CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416
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.
Affected configurations
• freebsd freebsd 14.3
• freebsd freebsd 14.4
• freebsd freebsd 15.0
• freebsd freebsd 15.1
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.asc Vendor Advisory