CVE-2026-58090

EUVD-2026-66235
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 3.95%
Affected Products (NVD)
VendorProductVersion
freebsdfreebsd
15.0:p1
freebsdfreebsd
15.0:p10
freebsdfreebsd
15.0:p11
freebsdfreebsd
15.0:p12
freebsdfreebsd
15.0:p2
freebsdfreebsd
15.0:p3
freebsdfreebsd
15.0:p4
freebsdfreebsd
15.0:p5
freebsdfreebsd
15.0:p6
freebsdfreebsd
15.0:p7
freebsdfreebsd
15.0:p8
freebsdfreebsd
15.0:p9
freebsdfreebsd
15.1:p1
freebsdfreebsd
15.1:p2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://security.freebsd.org/advisories/FreeBSD-SA-26:57.unix.asc