Security restrictons bypass in Linux kernel - CVE-2020-29373
Published: March 18, 2021
Vulnerability identifier: #VU51550
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-29373
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists in fs/io_uring.c in the Linux kernel due to insecure handling of the root directory during path lookups. A process inside a mount namespace can escape to unintended filesystem locations and read sensitive information.
Affected software
Linux kernel
SUSE Linux Enterprise Module for Live Patching
kernel-livepatch-5_3_18-24_49-default
kernel-livepatch-5_3_18-24_49-default-debuginfo
kernel-livepatch-SLE15-SP2_Update_10-debugsource
SUSE Linux Enterprise Module for Live Patching
kernel-livepatch-5_3_18-24_49-default
kernel-livepatch-5_3_18-24_49-default-debuginfo
kernel-livepatch-SLE15-SP2_Update_10-debugsource
How to mitigate CVE-2020-29373
Install updates from vendor's website.
Linux kernel - update to 5.6
kernel-livepatch-5_3_18-24_49-default - update to 2-2.2
kernel-livepatch-5_3_18-24_49-default-debuginfo - update to 2-2.2
kernel-livepatch-SLE15-SP2_Update_10-debugsource - update to 2-2.2
kernel-livepatch-5_3_18-24_49-default - update to 2-2.2
kernel-livepatch-5_3_18-24_49-default-debuginfo - update to 2-2.2
kernel-livepatch-SLE15-SP2_Update_10-debugsource - update to 2-2.2