CVE-2026-52928

af_unix: Reject SIOCATMARK on non-stream sockets

Published: 6/24/2026 Last updated: 7/4/2026 Reserved: 6/9/2026

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.

CNA assigner: Linux (416baaa9-dc9f-4396-8d5f-8c081fb06d67) Requested by: n/a

Opam packages affected (29)

albatross cdrom conf-bpftool conf-libbpf conf-linux-libc-dev core core_unix hvsock mirage-block-unix mm ocaml-probes ortools_solvers orun rawlink rawlink-eio rawlink-lwt restricted shell solo5 solo5-bindings-hvt solo5-bindings-spt solo5-cross-aarch64 solo5-kernel-ukvm tracy-client tuntap uring vhd-format vhd-format-lwt xapi-stdext-unix

Products affected (4)

Product	Vendor	Version
Linux	Linux	2008 R2 for x64-based Systems Service Pack 1 (Core installation)
Linux	Linux	2012
Linux	Linux	Apache Sling Commons Messaging Mail 1.0.0 1.0.0
Linux	Linux	v9.5 and prior

CVE-2026-52928

af_unix: Reject SIOCATMARK on non-stream sockets

Opam packages affected (29)

Products affected (4)

References (14)