CVE-2023-4244
Use-after-free in Linux kernel's netfilter: nf_tables component
HIGH 7.0EPSS 0.2%
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.
- Affected
- Linux · Kernel
- CVSS v3.1 NVD
- 7.0 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GOOGLE
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.24% chance of exploitation in the next 30 days, 14th percentile
- Published
- 2023-09-06
- Updated
- 2026-07-28
Proof-of-concept exploits (1)
- letsr00t/nft-catchall-uaf1★ · 2026-06-28
Exploit collections (2)
- linux/kernelctf/CVE-2023-4244_ltsgoogle/security-research
- linux/kernelctf/CVE-2023-4244_mitigationgoogle/security-research
Security advisories
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e91b0ebd99…
- https://kernel.dance/3e91b0ebd994635df2346353322ac51ce84ce6d8
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html