Resource management error in Linux kernel - CVE-2021-4440

Vulnerability identifier: #VU93596

CSH Severity: Low

CVSS v4.0: 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-2021-4440

CWE-ID: CWE-399

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
RecoverPoint for Virtual Machines
kgraft-patch-4_12_14-122_228-default
kernel-rt-debugsource
cluster-md-kmp-rt-debuginfo
kernel-rt_debug
kernel-rt
kernel-source-rt
kernel-devel-rt
dlm-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt_debug-devel
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-rt-devel
dlm-kmp-rt
cluster-md-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt-base
kernel-syms-rt
kernel-rt_debug-devel-debuginfo
gfs2-kmp-rt
kernel-rt-base-debuginfo
kernel-syms-azure
kernel-azure
kernel-azure-base
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-base-debuginfo
kernel-devel-azure
kernel-source-azure
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-default-debugsource
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-macros
kernel-default-devel
cluster-md-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-debuginfo
kernel-default-base
kernel-syms
dlm-kmp-default
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-base-debuginfo
dlm-kmp-default-debuginfo
gfs2-kmp-default
kernel-default
kernel-devel
kernel-source
kernel-obs-build
kernel-obs-build-debugsource
kernel-docs

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

The vulnerability exists due to resource management error within the SYM_CODE_START() function in arch/x86/xen/xen-asm.S, within the native_patch() function in arch/x86/kernel/paravirt_patch.c, within the paravirt_patch_default() and native_steal_clock() functions in arch/x86/kernel/paravirt.c, within the main() function in arch/x86/kernel/asm-offsets_64.c, within the SYM_INNER_LABEL() and SYM_CODE_END() functions in arch/x86/entry/entry_64.S. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/1424ab4bb386df9cc590c73afa55f13e9b00dea2
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.218