{"api_version":"1","generated_at":"2026-06-25T15:02:18+00:00","cve":"CVE-2026-53212","urls":{"html":"https://cve.report/CVE-2026-53212","api":"https://cve.report/api/cve/CVE-2026-53212.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53212","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53212"},"summary":{"title":"netfilter: nft_tunnel: fix use-after-free on object destroy","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:38","updated_at":"2026-06-25 09:16:38"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a","name":"https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43","name":"https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842","name":"https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05","name":"https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82","name":"https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef","name":"https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3","name":"https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e","name":"https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53212","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53212","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 349df61526d2e39decc685d246202e3e284cfe05 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 55b79b1ae42372012413ce0413181d26679b17ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 5e9ee18b27fde88cb6148202b33916c66693fe82 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 8767fe4079affa74314d7eb3220e700150289842 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba fda6573a46ad24f35348e024905ee5bdf729797e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba f9a0e4b61054cde89a2a77845293c726cc07cc43 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected af308b94a2a4a5a27bec9028354c4df444a7c8ba c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nft_tunnel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"349df61526d2e39decc685d246202e3e284cfe05","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"55b79b1ae42372012413ce0413181d26679b17ef","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"5e9ee18b27fde88cb6148202b33916c66693fe82","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"8767fe4079affa74314d7eb3220e700150289842","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"fda6573a46ad24f35348e024905ee5bdf729797e","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"f9a0e4b61054cde89a2a77845293c726cc07cc43","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"},{"lessThan":"c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a","status":"affected","version":"af308b94a2a4a5a27bec9028354c4df444a7c8ba","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nft_tunnel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.19"},{"lessThan":"4.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:39:16.888Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"},{"url":"https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"},{"url":"https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"},{"url":"https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"},{"url":"https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"},{"url":"https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"},{"url":"https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"},{"url":"https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"}],"title":"netfilter: nft_tunnel: fix use-after-free on object destroy","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53212","datePublished":"2026-06-25T08:39:16.888Z","dateReserved":"2026-06-09T07:44:35.391Z","dateUpdated":"2026-06-25T08:39:16.888Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:38","lastModifiedDate":"2026-06-25 09:16:38","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53212","Ordinal":"1","Title":"netfilter: nft_tunnel: fix use-after-free on object destroy","CVE":"CVE-2026-53212","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53212","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: nft_tunnel: fix use-after-free on object destroy"}]}}}