{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-22021","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-29T08:45:45.807Z","datePublished":"2025-04-16T10:20:37.695Z","dateUpdated":"2026-05-11T21:11:07.448Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:11:07.448Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: socket: Lookup orig tuple for IPv6 SNAT\n\nnf_sk_lookup_slow_v4 does the conntrack lookup for IPv4 packets to\nrestore the original 5-tuple in case of SNAT, to be able to find the\nright socket (if any). Then socket_match() can correctly check whether\nthe socket was transparent.\n\nHowever, the IPv6 counterpart (nf_sk_lookup_slow_v6) lacks this\nconntrack lookup, making xt_socket fail to match on the socket when the\npacket was SNATed. Add the same logic to nf_sk_lookup_slow_v6.\n\nIPv6 SNAT is used in Kubernetes clusters for pod-to-world packets, as\npods' addresses are in the fd00::/8 ULA subnet and need to be replaced\nwith the node's external address. Cilium leverages Envoy to enforce L7\npolicies, and Envoy uses transparent sockets. Cilium inserts an iptables\nprerouting rule that matches on `-m socket --transparent` and redirects\nthe packets to localhost, but it fails to match SNATed IPv6 packets due\nto that missing conntrack lookup."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/nf_socket_ipv6.c"],"versions":[{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"6488b96a79a26e19100ad872622f04e93b638d7f","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"58ab63d3ded2ca6141357a2b24eee8453d0f871d","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"1ca2169cc19dca893c7aae6af122852097435d16","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"1ec43100f7123010730b7ddfc3d5c2eac19e70e7","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"5251041573850e5020cd447374e23010be698898","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"2bb139e483f8cbe488d19d8c1135ac3615e2668c","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"41904cbb343d115931d6bf79aa2c815cac4ef72b","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"221c27259324ec1404f028d4f5a0f2ae7f63ee23","status":"affected","versionType":"git"},{"version":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","lessThan":"932b32ffd7604fb00b5c57e239a3cc4d901ccf6e","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/netfilter/nf_socket_ipv6.c"],"versions":[{"version":"3.13","status":"affected"},{"version":"0","lessThan":"3.13","status":"unaffected","versionType":"semver"},{"version":"5.4.292","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.236","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.180","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.133","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.86","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.22","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13.10","lessThanOrEqual":"6.13.*","status":"unaffected","versionType":"semver"},{"version":"6.14.1","lessThanOrEqual":"6.14.*","status":"unaffected","versionType":"semver"},{"version":"6.15","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.4.292"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.236"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.180"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.133"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.13.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.14.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6488b96a79a26e19100ad872622f04e93b638d7f"},{"url":"https://git.kernel.org/stable/c/58ab63d3ded2ca6141357a2b24eee8453d0f871d"},{"url":"https://git.kernel.org/stable/c/1ca2169cc19dca893c7aae6af122852097435d16"},{"url":"https://git.kernel.org/stable/c/1ec43100f7123010730b7ddfc3d5c2eac19e70e7"},{"url":"https://git.kernel.org/stable/c/5251041573850e5020cd447374e23010be698898"},{"url":"https://git.kernel.org/stable/c/2bb139e483f8cbe488d19d8c1135ac3615e2668c"},{"url":"https://git.kernel.org/stable/c/41904cbb343d115931d6bf79aa2c815cac4ef72b"},{"url":"https://git.kernel.org/stable/c/221c27259324ec1404f028d4f5a0f2ae7f63ee23"},{"url":"https://git.kernel.org/stable/c/932b32ffd7604fb00b5c57e239a3cc4d901ccf6e"}],"title":"netfilter: socket: Lookup orig tuple for IPv6 SNAT","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T19:41:09.284Z"}}]}}