CVE-2026-23066

HIGHNVD 7.85.5▼
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-02-04. NVD baseline CVSS 7.8; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
7.8
EG Score
5.5(medium)
EPSS
3.0%
KEV
Not listed

Published

February 4, 2026

Last Modified

June 1, 2026

Advisory Details (7)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cf969bddd6e69c5777fa89dc88402204e72f312a
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c6cebcb4e0b3140ec2ace45c020a9049527385d1
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c198628f3fca5c874d93874c233014d336e09f64
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/930114425065f7ace6e0c0630fab4af75e059ea8
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8fd3b5e297854a4da0f273169baf4b1b7b257b97
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2c28769a51deb6022d7fbd499987e237a01dd63a
generic

rxrpc: Fix recvmsg() unconditional requeue - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0464bf75590da75b8413c3e758c04647b4cdb3c6

Vendor Advisories for CVE-2026-23066(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:5.14.0-427.121.1.el9_42026-04-23redhat
redhatkernel-0:5.14.0-284.166.1.el9_22026-04-22redhat
redhatkernel-rt-0:5.14.0-284.166.1.rt14.451.el9_22026-04-22redhat
redhatkernel-0:6.12.0-55.69.1.el10_02026-04-20redhat
redhatkernel-0:5.14.0-570.108.1.el9_62026-04-20redhat
linuxKernel @ 5.10.258—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 122 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
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  17. 2026-07-13 22:30 UTCEPSS rescore
  18. 2026-07-13 08:08 UTCOSV refresh
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  21. 2026-07-12 05:46 UTCEPSS rescore
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  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-08 15:15 UTCEPSS rescore
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  1. 2026-07-08 15:15 UTCEPSS rescore
  2. 2026-07-07 13:46 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
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  5. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-06-25 13:49 UTCEPSS rescore
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  22. 2026-06-24 22:31 UTCOSV refresh
  23. 2026-06-24 14:05 UTCEPSS rescore
  24. 2026-06-24 14:05 UTCEPSS rescore
  25. 2026-06-23 21:33 UTCEPSS rescore
  26. 2026-06-23 21:32 UTCEPSS rescore
  27. 2026-06-22 14:25 UTCEPSS rescore
  28. 2026-06-22 14:25 UTCEPSS rescore
  29. 2026-06-21 14:56 UTCEPSS rescore
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  40. 2026-06-14 23:18 UTCEPSS rescore
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  44. 2026-06-11 14:00 UTCEPSS rescore
  45. 2026-06-10 22:18 UTCEPSS rescore
  46. 2026-06-10 13:22 UTCEPSS rescore
  47. 2026-06-08 14:17 UTCEPSS rescore
  48. 2026-06-08 14:17 UTCEPSS rescore
  49. 2026-06-07 21:43 UTCVendor advisory
  50. 2026-06-07 21:43 UTCGHSA enrichment
  51. 2026-06-07 15:25 UTCEPSS rescore
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  64. 2026-06-01 14:57 UTCOSV refresh
  65. 2026-06-01 13:51 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23066?
CVE-2026-23066 is a high vulnerability published on February 4, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpcrecvmsg() fails because MSGDONTWAIT 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…
When was CVE-2026-23066 disclosed?
CVE-2026-23066 was first published in the National Vulnerability Database on February 4, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23066 actively exploited?
CVE-2026-23066 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23066?
CVE-2026-23066 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.5.
How do I remediate CVE-2026-23066?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23066, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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