PT-2026-6136 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-06-02 · CVE-2026-23066

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw within the rxrpc subsystem related to the handling of recvmsg() calls. Specifically, an unconditional requeue of calls can occur if MSG DONTWAIT is specified and a mutex is already locked on a call at the front of the recvmsg queue. This can lead to corruption of the recvmsg queue, potentially resulting in use-after-free (UAF) conditions or refcount underruns. The issue arises from incorrectly requeuing calls already present in the queue and inappropriately calling rxrpc notify socket() when MSG PEEK is used without dequeuing the call.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

AZL-77250

CVE-2026-23066

ECHO-8037-DF07-6304

OPENSUSE-SU-2026:20416-1

RHSA-2026:10108

RHSA-2026:9095

RHSA-2026:9112

RHSA-2026:9512

RHSA-2026:9644

SUSE-SU-2026:20838-1

SUSE-SU-2026:20931-1

SUSE-SU-2026:21284-1

Affected Products

Linux Kernel

References · 408

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23066.json · Exploit
• https://cve.org/CVERecord?id=CVE-2026-23066 · Security Note
• https://osv.dev/vulnerability/AZL-77250 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2026-23066 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20838-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23066 · Security Note
• https://git.kernel.org/stable/c/2c28769a51deb6022d7fbd499987e237a01dd63a · Patch
• https://git.kernel.org/stable/c/930114425065f7ace6e0c0630fab4af75e059ea8 · Patch
• https://osv.dev/vulnerability/CVE-2026-23066 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2026-23066 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23066 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23066 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-23066 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23066 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-23066 · Vendor Advisory