Medium · published June 24, 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.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.15, < 5.15.211 | 5.15.211 |
| linux/linux_kernel | ≥ 5.16, < 6.1.177 | 6.1.177 |
| linux/linux_kernel | ≥ 6.2, < 6.6.144 | 6.6.144 |
| linux/linux_kernel | ≥ 6.7, < 6.12.88 | 6.12.88 |
| linux/linux_kernel | ≥ 6.13, < 6.18.30 | 6.18.30 |
| linux/linux_kernel | ≥ 6.19, < 7.0.7 | 7.0.7 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |