{"schema_version":"1.9.0","id":"CVE-2026-53212","published":"2026-06-25T08:39:16.888Z","modified":"2026-08-31T18:26:07.770447639Z","related":["CGA-c3gq-jxmq-ppvj","SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3790-1","SUSE-SU-2026:3810-1","openSUSE-SU-2026:21555-1"],"summary":"netfilter: nft_tunnel: fix use-after-free on object destroy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_tunnel: fix use-after-free on object destroy\n\nnft_tunnel_obj_destroy() calls metadata_dst_free() which directly\nkfree()s the metadata_dst, ignoring the dst_entry refcount. Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"af308b94a2a4a5a27bec9028354c4df444a7c8ba"},{"fixed":"349df61526d2e39decc685d246202e3e284cfe05"},{"fixed":"55b79b1ae42372012413ce0413181d26679b17ef"},{"fixed":"5e9ee18b27fde88cb6148202b33916c66693fe82"},{"fixed":"8767fe4079affa74314d7eb3220e700150289842"},{"fixed":"fda6573a46ad24f35348e024905ee5bdf729797e"},{"fixed":"941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"},{"fixed":"f9a0e4b61054cde89a2a77845293c726cc07cc43"},{"fixed":"c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53212.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53212.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"},{"type":"WEB","url":"https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53212.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53212"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53212.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}