SB2023061368 - Privilege escalation in Linux kernel
Published: June 13, 2023
Security Bulletin ID
SB2023061368
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2020-36694)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. A local user with CAP_NET_ADMIN capability in an unprivileged namespace can execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.
References
- https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10