Race condition in Google Android - CVE-2021-39686

Vulnerability identifier: #VU61096

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-2021-39686

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a race condition in the binder implementation in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Google Android
Debian Linux
openEuler
perf-debuginfo
kernel-debugsource
python2-perf-debuginfo
kernel-tools-debuginfo
kernel-debuginfo
python2-perf
kernel-tools
bpftool
perf
kernel-tools-devel
python3-perf
kernel-source
bpftool-debuginfo
python3-perf-debuginfo
kernel-devel
kernel
linux (Debian package)

Install updates from vendor's website.

Google Android - addressed in versions 10 2022-03-05, 11 2022-03-05, 12 2022-03-05
perf-debuginfo - update to 4.19.90-2204.4.0.0148
kernel-debugsource - update to 4.19.90-2204.4.0.0148
python2-perf-debuginfo - update to 4.19.90-2204.4.0.0148
kernel-tools-debuginfo - update to 4.19.90-2204.4.0.0148
kernel-debuginfo - update to 4.19.90-2204.4.0.0148
python2-perf - update to 4.19.90-2204.4.0.0148
kernel-tools - update to 4.19.90-2204.4.0.0148
bpftool - update to 4.19.90-2204.4.0.0148
perf - update to 4.19.90-2204.4.0.0148
kernel-tools-devel - update to 4.19.90-2204.4.0.0148
python3-perf - update to 4.19.90-2204.4.0.0148
kernel-source - update to 4.19.90-2204.4.0.0148
bpftool-debuginfo - update to 4.19.90-2204.4.0.0148
python3-perf-debuginfo - update to 4.19.90-2204.4.0.0148
kernel-devel - update to 4.19.90-2204.4.0.0148
kernel - update to 4.19.90-2204.4.0.0148
linux (Debian package) - update to 4.19.232-1

• https://source.android.com/security/bulletin/2022-03-01#details-05
• https://android.googlesource.com/kernel/common/+/d49297739550
• https://android.googlesource.com/kernel/common/+/3af7a2f61023
• https://android.googlesource.com/kernel/common/+/11db2de0af2a
• https://android.googlesource.com/kernel/common/+/a4eacf3227bd

• Multiple vulnerabilities in Google Android
• Debian update for linux 4.19
• Debian update for linux
• openEuler update for kernel