Use-after-free in Linux kernel - CVE-2022-49921

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Main Vulnerability Database Vulnerabilities #VU108219

Use-after-free in Linux kernel - CVE-2022-49921

Published: May 2, 2025 / Updated: May 10, 2025


Vulnerability identifier: #VU108219
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-49921
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the red_enqueue() function in net/sched/sch_red.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Live Patching
openSUSE Leap
openEuler
kernel-livepatch-5_14_21-150500_55_110-default-debuginfo
kernel-livepatch-5_14_21-150500_55_110-default
kernel-livepatch-SLE15-SP5_Update_27-debugsource
kernel-source
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
dlm-kmp-rt-debuginfo
kernel-rt_debug
kernel-rt
kernel-rt_debug-devel-debuginfo
kernel-rt-devel
gfs2-kmp-rt-debuginfo
kernel-source-rt
kselftests-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-devel-rt
kernel-rt-optional
kernel-rt_debug-vdso
kernel-rt-vdso
kernel-rt-debuginfo
cluster-md-kmp-rt
gfs2-kmp-rt
ocfs2-kmp-rt
kernel-rt-livepatch-devel
kernel-rt_debug-vdso-debuginfo
kernel-syms-rt
reiserfs-kmp-rt
kernel-rt-optional-debuginfo
kernel-rt_debug-debugsource
kernel-rt-devel-debuginfo
kernel-rt_debug-devel
dlm-kmp-rt
kernel-rt-extra-debuginfo
kernel-rt_debug-debuginfo
kernel-rt-livepatch
reiserfs-kmp-rt-debuginfo
kselftests-kmp-rt-debuginfo
kernel-rt-debugsource
kernel-rt-extra
kernel-rt-vdso-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-default
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-livepatch
kernel-default-livepatch-devel

How to mitigate CVE-2022-49921

Install update from vendor's website.

Linux kernel - update to 5.15.78
kernel-livepatch-5_14_21-150500_55_110-default-debuginfo - update to 1-150500.11.7.1
kernel-livepatch-5_14_21-150500_55_110-default - update to 1-150500.11.7.1
kernel-livepatch-SLE15-SP5_Update_27-debugsource - update to 1-150500.11.7.1
kernel-source - update to 4.19.90-2507.2.0.0335
kernel - update to 4.19.90-2507.2.0.0335
bpftool - update to 4.19.90-2507.2.0.0335
bpftool-debuginfo - update to 4.19.90-2507.2.0.0335
kernel-debuginfo - update to 4.19.90-2507.2.0.0335
kernel-debugsource - update to 4.19.90-2507.2.0.0335
kernel-devel - update to 4.19.90-2507.2.0.0335
kernel-tools - update to 4.19.90-2507.2.0.0335
kernel-tools-debuginfo - update to 4.19.90-2507.2.0.0335
kernel-tools-devel - update to 4.19.90-2507.2.0.0335
perf - update to 4.19.90-2507.2.0.0335
perf-debuginfo - update to 4.19.90-2507.2.0.0335
python2-perf - update to 4.19.90-2507.2.0.0335
python2-perf-debuginfo - update to 4.19.90-2507.2.0.0335
python3-perf - update to 4.19.90-2507.2.0.0335
python3-perf-debuginfo - update to 4.19.90-2507.2.0.0335
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt_debug - update to 5.14.21-150500.13.97.1
kernel-rt - update to 5.14.21-150500.13.97.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt-devel - update to 5.14.21-150500.13.97.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kernel-source-rt - update to 5.14.21-150500.13.97.1
kselftests-kmp-rt - update to 5.14.21-150500.13.97.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kernel-devel-rt - update to 5.14.21-150500.13.97.1
kernel-rt-optional - update to 5.14.21-150500.13.97.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.97.1
kernel-rt-vdso - update to 5.14.21-150500.13.97.1
kernel-rt-debuginfo - update to 5.14.21-150500.13.97.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.97.1
gfs2-kmp-rt - update to 5.14.21-150500.13.97.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.97.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.97.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.97.1
kernel-syms-rt - update to 5.14.21-150500.13.97.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.97.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.97.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.97.1
dlm-kmp-rt - update to 5.14.21-150500.13.97.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt-livepatch - update to 5.14.21-150500.13.97.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kernel-rt-debugsource - update to 5.14.21-150500.13.97.1
kernel-rt-extra - update to 5.14.21-150500.13.97.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.97.1
ocfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.97.1
kernel-default - update to 5.14.21-150500.55.110.1
kernel-default-debuginfo - update to 5.14.21-150500.55.110.1
kernel-default-debugsource - update to 5.14.21-150500.55.110.1
kernel-default-livepatch - update to 5.14.21-150500.55.110.1
kernel-default-livepatch-devel - update to 5.14.21-150500.55.110.1

External References

Related Security Bulletins