CVE-2022-29581

medium

Published 2022-11-15 · Modified 2022-11-11

CVSS v3

—

CVSS v2

—

VIR risk

5.5

Description

Improper Update of Reference Count vulnerability in net/sched of Linux Kernel allows local attacker to cause privilege escalation to root. This issue affects: Linux Kernel versions prior to 5.18; version 4.14 and later versions.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: alma — https://errata.almalinux.org/9/ALSA-2022-8267.html

vendor Authored 2026-05-27

Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2022-7444.html

vendor Authored 2026-05-27

Vendor advisory: alma — https://access.redhat.com/errata/RHSA-2022:7444

vendor Authored 2026-05-27

Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2022-7683.html

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2120175

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2112693

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2096178

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2070220

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2069408

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2062284

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/1946279

vendor Authored 2026-05-27

Vendor advisory: alma — https://access.redhat.com/errata/RHSA-2022:7683

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2022-29581

vendor Authored 2026-05-27

Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2022:7444

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2022-29581.html

vendor Authored 2026-05-27

Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2022:7683

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2022:8267

vendor Authored 2026-05-27

Vendor advisory: alma — https://errata.almalinux.org/9/ALSA-2022-7933.html

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2129152

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2123695

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2115278

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2115065

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2114878

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2103153

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2103148

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2090241

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2090240

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2090237

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2090226

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2089815

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2088021

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2084479

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2084183

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2084125

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2074208

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2073064

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2071022

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2070205

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2066819

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2066706

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2066614

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2059928

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2058395

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2053632

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2052312

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2051444

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/2037386

vendor Authored 2026-05-27

Vendor advisory: alma — https://bugzilla.redhat.com/1980646

vendor Authored 2026-05-27

Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2022:7933

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description kernel: use-after-free due to improper update of reference count in net/sched/cls_u32.c Red Hat statement Keeping the impact Moderate, because only memory leak can happen by default, and both hard to reproduce (at least reproducer not exists yet). CVSS v3: 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) Errata / fixed releases ProductPackageAdvisoryReleased Red Hat Enterprise Linux…

Description

kernel: use-after-free due to improper update of reference count in net/sched/cls_u32.c

Red Hat statement

Keeping the impact Moderate, because only memory leak can happen by default, and both hard to reproduce (at least reproducer not exists yet).

CVSS v3: 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 8	`kernel-rt-0:4.18.0-425.3.1.rt7.213.el8`	RHSA-2022:7444	2022-11-08T00:00:00Z
Red Hat Enterprise Linux 8	`kernel-0:4.18.0-425.3.1.el8`	RHSA-2022:7683	2022-11-08T00:00:00Z
Red Hat Enterprise Linux 8.6 Extended Update Support	`kernel-0:4.18.0-372.93.1.el8_6`	RHSA-2024:0930	2024-02-21T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-162.6.1.el9_1`	RHSA-2022:8267	2022-11-15T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-rt-0:5.14.0-162.6.1.rt21.168.el9_1`	RHSA-2022:7933	2022-11-15T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-162.6.1.el9_1`	RHSA-2022:8267	2022-11-15T00:00:00Z
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	`kernel-0:4.18.0-372.93.1.el8_6`	RHSA-2024:0930	2024-02-21T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 6	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel-rt`	Out of support scope

Apply commands

bash fix

Apply RHSA-2022:7444 for Red Hat Enterprise Linux 8

yum update -y kernel-rt
# or:
dnf upgrade -y kernel-rt

OS impact

OS	Version	Status	Fixed in
rhel	9	fixed
almalinux	9	fixed	`kernel-rt-debug-core-5.14.0-162.6.1.rt21.168.el9_1.x86_64.rpm`
rocky	8	fixed
sles		affected
debian	bookworm	fixed	`5.17.6-1`
debian	bullseye	fixed	`5.10.113-1`
debian	forky	fixed	`5.17.6-1`
debian	sid	fixed	`5.17.6-1`
debian	trixie	fixed	`5.17.6-1`
almalinux	8	fixed	`kernel-doc-4.18.0-425.3.1.el8.noarch.rpm`

References

Verify integrity in audit chain (admin only). AS-IS.