High 7.8Published Feb 4, 2026

CVE-2026-23066rxrpc: Fix recvmsg() unconditional requeue

Updated under an hour ago (Oct 27, 2026, 11:40 PM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	540b1c48c37ac0ad66212004db21e1ff7e2d78be builds before 8fd3b5e297854a4da0f273169baf4b1b7b257b97; from 540b1c48c37ac0ad66212004db21e1ff7e2d78be before c198628f3fca5c874d93874c233014d336e09f64; from 540b1c48c37ac0ad66212004db21e1ff7e2d78be before c6cebcb4e0b3140ec2ace45c020a9049527385d1; 540b1c48c37ac0ad66212004db21e1ff7e2d78be builds before 0464bf75590da75b8413c3e758c04647b4cdb3c6; from 540b1c48c37ac0ad66212004db21e1ff7e2d78be before cf969bddd6e69c5777fa89dc88402204e72f312a; from 540b1c48c37ac0ad66212004db21e1ff7e2d78be before 930114425065f7ace6e0c0630fab4af75e059ea8; 540b1c48c37ac0ad66212004db21e1ff7e2d78be builds before 2c28769a51deb6022d7fbd499987e237a01dd63a	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.11 before 6.18.8; 6.19; 6.19; 6.19; 6.19; 6.19; 6.19	NVD

References

References

https://git.kernel.org/stable/c/8fd3b5e297854a4da0f273169baf4b1b7b257b97
https://git.kernel.org/stable/c/c198628f3fca5c874d93874c233014d336e09f64
https://git.kernel.org/stable/c/c6cebcb4e0b3140ec2ace45c020a9049527385d1
https://git.kernel.org/stable/c/0464bf75590da75b8413c3e758c04647b4cdb3c6
https://git.kernel.org/stable/c/cf969bddd6e69c5777fa89dc88402204e72f312a
https://git.kernel.org/stable/c/930114425065f7ace6e0c0630fab4af75e059ea8	patch
https://git.kernel.org/stable/c/2c28769a51deb6022d7fbd499987e237a01dd63a	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.