Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.11, < 6.18.8 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0464bf75590da75b8413c3e758c04647b4cdb3c6
- https://git.kernel.org/stable/c/2c28769a51deb6022d7fbd499987e237a01dd63aPatch
- https://git.kernel.org/stable/c/930114425065f7ace6e0c0630fab4af75e059ea8Patch
- https://git.kernel.org/stable/c/cf969bddd6e69c5777fa89dc88402204e72f312a
FAQ
What is CVE-2026-23066?
CVE-2026-23066 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front o...
How severe is CVE-2026-23066?
CVE-2026-23066 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23066?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.