SB2022022245 - SUSE update for the Linux Kernel (Live Patch 41 for SLE 12 SP3)
Published: February 22, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2021-4083)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the Linux kernel's garbage collection for Unix domain socket file handlers. A local user can call close() and fget() simultaneously and can potentially trigger a race condition, which in turn leads to a use-after-free error and allows privilege escalation.
2) Use-after-free (CVE-ID: CVE-2021-4202)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the nci_request() function in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. A local user can cause a data race problem while the device is getting removed and escalate privileges on the system.
Remediation
Install update from vendor's website.