CVE-2026-52928

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.

Score

CVSS 3.1 5.5 Medium

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-06-24

Last modified

2026-10-15

Affected products

• Linux Kernel (Linux)
• Simatic S7-1500 Tm Mfp - Gnulinux Subsystem (Siemens)

References

• https://git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67
• https://git.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85
• https://git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b
• https://git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6
• https://git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729
• https://git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a
• https://git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html