{"id":"CVE-2023-6817","title":"A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.\n\nThe function nft_pipapo_walk did not skip inactive elements during set walk which could lead dou…","summary":"A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.\n\nThe function nft_pipapo_walk did not skip inactive elements during set walk which could lead dou…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.6, < 5.10.204","linux_kernel >= 5.11, < 5.15.143","linux_kernel >= 5.16, < 6.1.68","linux_kernel >= 6.2, < 6.6.7","linux_kernel = 6.7"],"patched":["linux_kernel 6.6.7"],"published":"2023-12-18","updated":"2026-10-14","sourceUpdated":"2026-10-14T23:17:20.033","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-6817","references":[{"url":"http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html","label":"cve-coordination@google.com"},{"url":"http://www.openwall.com/lists/oss-security/2023/12/22/13","label":"cve-coordination@google.com"},{"url":"http://www.openwall.com/lists/oss-security/2023/12/22/6","label":"cve-coordination@google.com"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316a","label":"cve-coordination@google.com"},{"url":"https://kernel.dance/317eb9685095678f2c9f5a8189de698c5354316a","label":"cve-coordination@google.com"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html","label":"cve-coordination@google.com"},{"url":"http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2023/12/22/13","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2023/12/22/6","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316a","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kernel.dance/317eb9685095678f2c9f5a8189de698c5354316a","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.00334,"epssPercentile":0.25062,"ingestedAt":"2026-10-15T00:02:07.134Z","slug":"CVE-2023-6817","body":"## Overview\n\nA use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.\n\nThe 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.\n\nWe recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.\n\n## Affected\n\n- `linux_kernel >= 5.6, < 5.10.204`\n- `linux_kernel >= 5.11, < 5.15.143`\n- `linux_kernel >= 5.16, < 6.1.68`\n- `linux_kernel >= 6.2, < 6.6.7`\n- `linux_kernel = 6.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.6.7`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}