CVE-2023-6817

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free. We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-25)

CWE

CWE-416

Published

2023-12-18

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

References

• http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html
• http://www.openwall.com/lists/oss-security/2023/12/22/13
• http://www.openwall.com/lists/oss-security/2023/12/22/6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316a
• https://kernel.dance/317eb9685095678f2c9f5a8189de698c5354316a

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