CVE-2026-58090 Use-after-free in unix SOCK_STREAM message handling

High 7.8 Published 26 Aug 2026 Updated 27 Aug 2026

A use-after-free in FreeBSD's unix socket handling allows local attackers to escalate privileges.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-58090?

CVE-2026-58090 is a high-severity use after free vulnerability in Freebsd Freebsd, published on 26 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket buffer before processing them. Some error paths would free those messages, leaving freed data mbufs in the receive socket buffer.

An unprivileged local user can exploit this use-after-free to escalate privileges.

Weakness: CWE-416

Which versions are affected by CVE-2026-58090?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2026-58090?

No fix has been published for CVE-2026-58090 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-58090 being exploited?

There is no known exploitation of CVE-2026-58090 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-35mj-6q95-hqwx.