CVE-2023-4244: Debian Linux

High severity, CVSS 7.0. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Debian Debian Linux: version 10.0 only
• Linux Linux Kernel: before 4.19.316 (fixed in 4.19.316); from 4.20, before 5.4.262 (fixed in 5.4.262); from 5.5, before 5.10.198 (fixed in 5.10.198); from 5.11, before 5.15.134 (fixed in 5.15.134); from 5.16, before 6.1.56 (fixed in 6.1.56); from 6.2.0, before 6.4.11 (fixed in 6.4.11)

Published 2023-09-06. Last modified 2026-07-30.