Bug 2492096 (CVE-2026-52928) - CVE-2026-52928 kernel: af_unix: Reject SIOCATMARK on non-stream sockets
Summary: CVE-2026-52928 kernel: af_unix: Reject SIOCATMARK on non-stream sockets
Keywords:
Status: NEW
Alias: CVE-2026-52928
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-24 08:01 UTC by OSIDB Bzimport
Modified: 2026-06-24 16:46 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-24 08:01:48 UTC 
In the Linux kernel, the following vulnerability has been resolved:

af_unix: Reject SIOCATMARK on non-stream sockets

SIOCATMARK reports whether the receive queue is at the urgent mark for
MSG_OOB.

In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets.
SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(),
so they should not support SIOCATMARK either.

Return -EOPNOTSUPP for non-stream sockets before checking the receive
queue.
Comment 1 Mauro Matteo Cascella 2026-06-24 16:43:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062432-CVE-2026-52928-de38@gregkh/T
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