FreeBSD Use-After-Free in SOCK_STREAM Receive Path Privilege Escalation
CVE-2026-58090 Published on August 26, 2026

Use-after-free in unix SOCK_STREAM message handling
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-58090 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

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

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2026-58090 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2026-58090

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FreeBSD
 

Affected Versions

FreeBSD: