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CVE-2026-23066 is a race-related queue-management flaw in the Linux kernel RxRPC subsystem's rxrpc_recvmsg() path. When recvmsg() is invoked with MSG_DONTWAIT and the call at the head of the receive queue has a locked mutex, vulnerable code requeues the call without determining whether it is already queued. The call can already be queued when MSG_PEEK prevented its dequeue or when the I/O thread requeued it. Reinserting an already queued call can corrupt the RxRPC recvmsg queue, causing use-after-free conditions or reference-count underruns. The correction requeues only calls not already present, moves already queued calls to the front, balances the dequeue-acquired reference when appropriate, and corrects MSG_PEEK notification handling.
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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.
A Linux kernel denial-of-service vulnerability caused by unsafe requeue handling in rxrpc_recvmsg.
A Linux kernel denial-of-service vulnerability caused by unsafe requeue handling in rxrpc_recvmsg.
A Linux kernel denial-of-service vulnerability caused by unsafe requeue handling in rxrpc_recvmsg.
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Cross-references every affected SKU, including bundled OEM variants.
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