{"id":"CVE-2023-3609","title":"A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\n\n\nIf tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing…","summary":"A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\n\n\nIf tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing…","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"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.14, < 4.14.322","linux_kernel >= 4.15, < 4.19.291","linux_kernel >= 4.20, < 5.4.248","linux_kernel >= 5.5, < 5.10.185","linux_kernel >= 5.11, < 5.15.118","linux_kernel >= 5.16, < 6.1.35","linux_kernel >= 6.2, < 6.3.9","linux_kernel = 6.4","debian_linux = 10.0","debian_linux = 11.0"],"patched":["linux_kernel 6.3.9"],"published":"2023-07-21","updated":"2026-09-11","sourceUpdated":"2026-09-11T16:16:30.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-3609","references":[{"url":"http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html","label":"cve-coordination@google.com"},{"url":"http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html","label":"cve-coordination@google.com"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc","label":"cve-coordination@google.com"},{"url":"https://kernel.dance/04c55383fa5689357bcdd2c8036725a55ed632bc","label":"cve-coordination@google.com"},{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html","label":"cve-coordination@google.com"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html","label":"cve-coordination@google.com"},{"url":"https://security.netapp.com/advisory/ntap-20230818-0005/","label":"cve-coordination@google.com"},{"url":"https://www.debian.org/security/2023/dsa-5480","label":"cve-coordination@google.com"},{"url":"http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kernel.dance/04c55383fa5689357bcdd2c8036725a55ed632bc","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20230818-0005/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2023/dsa-5480","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","exploit-available"],"epss":0.00454,"epssPercentile":0.38624,"exploits":{"github":1,"githubRepos":["https://github.com/Jturnxd/CVE-2023-3609"],"checkedAt":"2026-09-21T15:25:51.045Z"},"exploitAvailable":true,"ingestedAt":"2026-07-30T17:54:54.534Z","slug":"CVE-2023-3609","body":"## Overview\n\nA use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\n\n\nIf tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.\n\n\n\nWe recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.\n\n## Affected\n\n- `linux_kernel >= 4.14, < 4.14.322`\n- `linux_kernel >= 4.15, < 4.19.291`\n- `linux_kernel >= 4.20, < 5.4.248`\n- `linux_kernel >= 5.5, < 5.10.185`\n- `linux_kernel >= 5.11, < 5.15.118`\n- `linux_kernel >= 5.16, < 6.1.35`\n- `linux_kernel >= 6.2, < 6.3.9`\n- `linux_kernel = 6.4`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.3.9`","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":4652,"id":"CVE-2023-3609","ts":1788887197276,"field":"exploit_available","old":"false","new":"true"},{"seq":3535,"id":"CVE-2023-3609","ts":1788886313357,"field":"exploit_available","old":"true","new":"false"},{"seq":2389,"id":"CVE-2023-3609","ts":1788882982665,"field":"exploit_available","old":"false","new":"true"},{"seq":1418,"id":"CVE-2023-3609","ts":1788882395554,"field":"exploit_available","old":"true","new":"false"},{"seq":532,"id":"CVE-2023-3609","ts":1788881831683,"field":"exploit_available","old":"false","new":"true"}]}