Use After Free in Linux Kernel
CVE-2023-4244
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Due to a race condition between nf_tables netlink control plane transaction and nft_set element garbage collection, it is possible to underflow the reference counter causing a use-after-free vulnerability. We recommend upgrading past commit 3e91b0ebd994635df2346353322ac51ce84ce6d8.
Vulnerability class: Use-After-Free
EPSS: 0.002 (13.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions 6.2, 5.5, 5.11
- Linux Linux_kernel
- Debian Debian_linux — versions 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@google.com (Patch, Mailing List, patch, Issue Tracking, Vendor Advisory)
- cve-coordination@google.com (Patch, Vendor Advisory)
- cve-coordination@google.com (Mailing List, Third Party Advisory)
- cve-coordination@google.com (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-4244?
- CVE-2023-4244 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-09-06.
- How severe is CVE-2023-4244?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-4244 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.