SB2023082002 - Privilege escalation in Linux kernel netfilter
Published: August 20, 2023 Updated: January 3, 2025
Security Bulletin ID
SB2023082002
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-2023-4147)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.
References
- https://access.redhat.com/security/cve/CVE-2023-4147
- https://www.spinics.net/lists/stable/msg671573.html
- https://bugzilla.redhat.com/show_bug.cgi?id=2225239
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ebc1064e4874d5987722a2ddbc18f94aa53b211
- https://www.debian.org/security/2023/dsa-5480