{"id":"CVE-2023-53619","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Avoid nf_ct_helper_hash uses after free\n\nIf nf_conntrack_init_start() fails (for example due to a\nregister_nf_conntrack_bpf() failure), the nf_con…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Avoid nf_ct_helper_hash uses after free\n\nIf nf_conntrack_init_start() fails (for example due to a\nregister_nf_conntrack_bpf() failure), the nf_con…","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 >= 3.6, < 4.14.322","linux_kernel >= 4.15, < 4.19.291","linux_kernel >= 4.20, < 5.4.251","linux_kernel >= 5.5, < 5.10.188","linux_kernel >= 5.11, < 5.15.121","linux_kernel >= 5.16, < 6.1.39","linux_kernel >= 6.2, < 6.4.4","linux_kernel = 6.5"],"patched":["linux_kernel 6.4.4"],"published":"2025-10-07","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:44.370","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53619","references":[{"url":"https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.0022,"epssPercentile":0.12412,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:35:57.896822Z"},"ingestedAt":"2026-10-15T22:48:25.411Z","slug":"CVE-2023-53619","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Avoid nf_ct_helper_hash uses after free\n\nIf nf_conntrack_init_start() fails (for example due to a\nregister_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()\nclean-up path frees the nf_ct_helper_hash map.\n\nWhen built with NF_CONNTRACK=y, further netfilter modules (e.g:\nnetfilter_conntrack_ftp) can still be loaded and call\nnf_conntrack_helpers_register(), independently of whether nf_conntrack\ninitialized correctly. This accesses the nf_ct_helper_hash dangling\npointer and causes a uaf, possibly leading to random memory corruption.\n\nThis patch guards nf_conntrack_helper_register() from accessing a freed\nor uninitialized nf_ct_helper_hash pointer and fixes possible\nuses-after-free when loading a conntrack module.\n\n## Affected\n\n- `linux_kernel >= 3.6, < 4.14.322`\n- `linux_kernel >= 4.15, < 4.19.291`\n- `linux_kernel >= 4.20, < 5.4.251`\n- `linux_kernel >= 5.5, < 5.10.188`\n- `linux_kernel >= 5.11, < 5.15.121`\n- `linux_kernel >= 5.16, < 6.1.39`\n- `linux_kernel >= 6.2, < 6.4.4`\n- `linux_kernel = 6.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.4.4`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}