Deadlock in Linux kernel - CVE-2021-46987

Vulnerability identifier: #VU87739

CSH Severity: Low

CVSS v4 BT: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46987

CWE-ID: CWE-833

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a deadlock when cloning inline extent with low amount of free metadata space in btrfs. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Live Patching
openEuler
kgraft-patch-4_12_14-122_269-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-debugsource
kernel-default-debuginfo
kernel-default-devel
gfs2-kmp-default
kernel-default-base
cluster-md-kmp-default
dlm-kmp-default
kernel-default-base-debuginfo
ocfs2-kmp-default-debuginfo
kernel-syms
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default
kernel-macros
kernel-source
kernel-devel
kernel-default-man
kernel-default-devel-debuginfo
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-tools-debuginfo
kernel
kernel-tools-devel
bpftool
bpftool-debuginfo
kernel-debugsource
kernel-headers
perf-debuginfo
kernel-tools
perf
python3-perf-debuginfo
kernel-debuginfo
python3-perf

Install updates from vendor's website.

Linux kernel - addressed in versions 5.11.22, 5.12.5, 5.13
kgraft-patch-4_12_14-122_269-default - update to 1-8.3.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.269.1
ocfs2-kmp-default - update to 4.12.14-122.269.1
kernel-default-debugsource - update to 4.12.14-122.269.1
kernel-default-debuginfo - update to 4.12.14-122.269.1
kernel-default-devel - update to 4.12.14-122.269.1
gfs2-kmp-default - update to 4.12.14-122.269.1
kernel-default-base - update to 4.12.14-122.269.1
cluster-md-kmp-default - update to 4.12.14-122.269.1
dlm-kmp-default - update to 4.12.14-122.269.1
kernel-default-base-debuginfo - update to 4.12.14-122.269.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.269.1
kernel-syms - update to 4.12.14-122.269.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.269.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.269.1
kernel-default - update to 4.12.14-122.269.1
kernel-macros - update to 4.12.14-122.269.1
kernel-source - update to 4.12.14-122.269.1
kernel-devel - update to 4.12.14-122.269.1
kernel-default-man - update to 4.12.14-122.269.1
kernel-default-devel-debuginfo - update to 4.12.14-122.269.1
kernel-default-kgraft - update to 4.12.14-122.269.1
kernel-default-kgraft-devel - update to 4.12.14-122.269.1
kernel-tools-debuginfo - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-tools-devel - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
bpftool - update to 5.10.0-60.130.0.157
bpftool-debuginfo - update to 5.10.0-60.130.0.157
kernel-debugsource - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-headers - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
perf-debuginfo - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-source - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-tools - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
perf - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-devel - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
python3-perf-debuginfo - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
kernel-debuginfo - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105
python3-perf - addressed in versions 5.10.0-60.130.0.157, 5.10.0-136.68.0.148, 5.10.0-153.47.0.125, 5.10.0-192.0.0.105

• https://git.kernel.org/stable/c/d5347827d0b4b2250cbce6eccaa1c81dc78d8651
• https://git.kernel.org/stable/c/96157707c0420e3d3edfe046f1cc797fee117ade
• https://git.kernel.org/stable/c/f9baa501b4fd6962257853d46ddffbc21f27e344
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.22
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13

• Denial of service in Linux kernel btrfs
• openEuler 22.03 LTS update for kernel
• openEuler 22.03 LTS SP1 update for kernel
• openEuler 22.03 LTS SP2 update for kernel
• openEuler 22.03 LTS SP3 update for kernel
• SUSE update for the Linux Kernel