CVE-2026-23066

Advisory lineage Upstream: 0 Downstream: 10
Modified
Published: 04 Feb 2026, 16:07
Last modified:01 Jun 2026, 16:10

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 Feb 2026, 16:07
Published
Vulnerability first disclosed
01 Jun 2026, 16:10
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 5%

Techniques & Countermeasures

  • CWE-674•Uncontrolled Recursion

    The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Affected Systems

  • linux•linux

    ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < 8fd3b5e297854a4da0f273169baf4b1b7b257b97 | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < c198628f3fca5c874d93874c233014d336e09f64 | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < c6cebcb4e0b3140ec2ace45c020a9049527385d1 | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < 0464bf75590da75b8413c3e758c04647b4cdb3c6 | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < cf969bddd6e69c5777fa89dc88402204e72f312a | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < 930114425065f7ace6e0c0630fab4af75e059ea8 | ≥ 540b1c48c37ac0ad66212004db21e1ff7e2d78be, < 2c28769a51deb6022d7fbd499987e237a01dd63a | 4.11

  • linux•linux_kernel

    ≥ 4.11, < 6.18.8 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6

References (7)