Answer in brief
CVE-2026-23066 records a High severity (CVSS 7.8) vulnerability in rxrpc: Fix recvmsg() unconditional requeue. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <8fd3b5e297854a4da0f273169baf4b1b7b257b97 || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <c198628f3fca5c874d93874c233014d336e09f64 || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <c6cebcb4e0b3140ec2ace45c020a9049527385d1 || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <0464bf75590da75b8413c3e758c04647b4cdb3c6 || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <cf969bddd6e69c5777fa89dc88402204e72f312a || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <930114425065f7ace6e0c0630fab4af75e059ea8 || >=540b1c48c37ac0ad66212004db21e1ff7e2d78be <2c28769a51deb6022d7fbd499987e237a01dd63a | 8fd3b5e297854a4da0f273169baf4b1b7b257b97, c198628f3fca5c874d93874c233014d336e09f64, c6cebcb4e0b3140ec2ace45c020a9049527385d1, 0464bf75590da75b8413c3e758c04647b4cdb3c6, cf969bddd6e69c5777fa89dc88402204e72f312a, 930114425065f7ace6e0c0630fab4af75e059ea8, 2c28769a51deb6022d7fbd499987e237a01dd63a |
| Linux/Linuxgeneric | 4.11 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Feb 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.