Use-after-free in Linux kernel - CVE-2020-36387

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Main Vulnerability Database Vulnerabilities #VU83430

Use-after-free in Linux kernel - CVE-2020-36387

Published: June 7, 2021 / Updated: February 24, 2023


Vulnerability identifier: #VU83430
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-2020-36387
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a use-after-free error within thefs/io_uring.c. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.


Affected software

Linux kernel
openEuler
kernel
kernel-devel
perf
kernel-debugsource
python2-perf
python3-perf-debuginfo
bpftool
python3-perf
bpftool-debuginfo
kernel-source
kernel-tools-devel
kernel-debuginfo
kernel-tools
perf-debuginfo
python2-perf-debuginfo
kernel-tools-debuginfo

How to mitigate CVE-2020-36387

Install update from vendor's website.

Linux kernel - update to 5.8.2
kernel - update to 4.19.90-2107.4.0.0097
kernel-devel - update to 4.19.90-2107.4.0.0097
perf - update to 4.19.90-2107.4.0.0097
kernel-debugsource - update to 4.19.90-2107.4.0.0097
python2-perf - update to 4.19.90-2107.4.0.0097
python3-perf-debuginfo - update to 4.19.90-2107.4.0.0097
bpftool - update to 4.19.90-2107.4.0.0097
python3-perf - update to 4.19.90-2107.4.0.0097
bpftool-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-source - update to 4.19.90-2107.4.0.0097
kernel-tools-devel - update to 4.19.90-2107.4.0.0097
kernel-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools - update to 4.19.90-2107.4.0.0097
perf-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools-debuginfo - update to 4.19.90-2107.4.0.0097

External References

Related Security Bulletins