What’s Vulnerable › Vulnerabilities

CVE-2023-5197: Use-after-free in Linux kernel's netfilter: nf_tables component

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-27 · updated 2026-10-14
• Weakness: CWE-416

Description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Addition and removal of rules from chain bindings within the same transaction causes leads to use-after-free. We recommend upgrading past commit f15f29fd4779be8a418b66e9d52979bb6d6c2325.

Affected products

• Debian Linux: 10.0
• Linux kernel: from 5.9.0 before 5.10.198; from 5.11 before 5.15.134; from 5.16 before 6.1.56; from 6.2 before 6.5.6 — fixed in 5.10.198, 5.15.134, 6.1.56, 6.5.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.198, 5.15.134, 6.1.56, 6.5.6. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f15f29fd4779be8a418b66e9d52979bb6d6c2325
• https://kernel.dance/f15f29fd4779be8a418b66e9d52979bb6d6c2325
• https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
• http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f15f29fd4779be8a418b66e9d52979bb6d6c2325
• https://kernel.dance/f15f29fd4779be8a418b66e9d52979bb6d6c2325
• https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
• https://cert-portal.siemens.com/productcert/html/ssa-794697.html

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