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CVE-2026-23066 is a memory-safety vulnerability in the Linux kernel RxRPC subsystem. When rxrpc_recvmsg() fails with MSG_DONTWAIT because the call at the front of the receive queue has its mutex locked, it unconditionally requeues that call, even if the call is already queued. A call can remain queued because MSG_PEEK prevented its removal or because the I/O thread requeued it. Duplicate requeuing can corrupt the receive queue, potentially causing use-after-free conditions, reference-count underruns, and denial of service. The correction also addresses reference management and inappropriate socket notifications during MSG_PEEK processing.
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A Linux kernel RxRPC vulnerability in rxrpc_recvmsg() can cause an already-queued call to be requeued when MSG_DONTWAIT encounters a locked call mutex. This can corrupt the receive queue, causing use-after-free conditions or reference-count underruns. The advisory rates it medium severity, with a CVSS v3 base score of 5.5 and local, low-privilege exploitation affecting availability. The fix checks queue membership before requeuing and corrects related reference handling and MSG_PEEK notification behavior.
A Linux kernel RxRPC vulnerability in rxrpc_recvmsg() where unconditional requeueing of a call can corrupt the recvmsg queue, potentially causing use-after-free conditions or refcount underruns.
Unsafe requeue handling in the Linux kernel rxrpc_recvmsg function can cause denial of service. The advisory provides a patch through updated kernel packages.
A Linux kernel denial-of-service vulnerability caused by unsafe requeue handling in rxrpc_recvmsg.
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