SB2020081921 - Privilege escalation in Linux kernel
Published: August 19, 2020 Updated: January 19, 2021
Security Bulletin ID
SB2020081921
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2020-14356)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a NULL pointer dereference error in the Linux kernel cgroupv2 subsystem during system reboot. A local user can crash the system or execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00047.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00007.html
- https://bugzilla.kernel.org/show_bug.cgi?id=208003
- https://bugzilla.redhat.com/show_bug.cgi?id=1868453
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
- https://lore.kernel.org/netdev/CAM_iQpUKQJrj8wE+Qa8NGR3P0L+5Uz=qo-O5+k_P60HzTde6aw%40mail.gmail.com/t/
- https://security.netapp.com/advisory/ntap-20200904-0002/
- https://usn.ubuntu.com/4483-1/
- https://usn.ubuntu.com/4484-1/
- https://usn.ubuntu.com/4526-1/