High7.0Red Hat Linux

High [CVE-2026-23074] Linux kernel: Use-after-free in teql queueing discipline can lead to privilege escalation

This high-severity Red Hat Linux advisory covers CVE-2026-23074 affecting Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.2 Advanced Update Support.

CVE-2026-23074 Published Feb 4, 2026

CVE-2026-23074

Affected products & platforms

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Summary

Linux kernel: Use-after-free in teql queueing discipline can lead to privilege escalation. Red Hat rates this important (CVSS 7).

Weakness: CWE-825. Affected package(s): kernel, kernel-rt.

Resolved in Red Hat advisory RHSA-2026:3634 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 6 more.

Affected versions

kernel-0:3.10.0-1160.147.1.el7
kernel-0:4.18.0-477.130.1.el8_8
kernel-0:4.18.0-553.107.1.el8_10
kernel-0:4.18.0-193.187.1.el8_2
kernel-0:4.18.0-372.181.1.el8_6
kernel-rt-0:3.10.0-1160.147.1.rt56.1299.el7
kernel-rt-0:4.18.0-553.107.1.rt7.448.el8_10
kernel-0:4.18.0-305.186.1.el8_4
kernel-0:2.6.32-754.59.1.el6

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:3634

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:3634 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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