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.
Fix
Patch, vendor advisory and mitigation references on NVD 7
- https://git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a Patch
- https://git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6 Patch
- https://git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b Patch
- https://git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729 Patch
- https://git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5 Patch
- https://git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 Patch
- https://git.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85 Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.5 · linuxNVD modified 2026-10-15 02:19
Affected (CPE criteria) 3
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
References 8
- https://git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a Patch
- https://git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6 Patch
- https://git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b Patch
- https://git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729 Patch
- https://git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5 Patch
- https://git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 Patch
- https://git.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85 Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html