{"schema":"threatline.record/2","record":{"id":"CVE-2026-97612","aliases":[],"summary":"net: mpls: clear inner_protocol when the last label is popped","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mpls: clear inner_protocol when the last label is popped\n\nskb_mpls_push() records the pre-encapsulation network header once, gated\non !skb->inner_protocol. skb_mpls_pop() never clears that record, so it\noutlives the encapsulation it describes.\n\nOpen vSwitch can then re-push MPLS onto a packet whose\ninner_network_header still points at the older, deeper offset: push a\nlabel, pop every label, recirculate (ovs_flow_key_update() re-derives\nkey->eth.type and resets network_header, but leaves inner_*), then push\nagain. ovs_fragment() trusts the record:\n\n\tskb->network_header = skb->inner_network_header;\n\nso skb_network_offset() goes negative. The bound check is signed:\n\n\tif (skb_network_offset(skb) > MAX_L2_LEN)\n\na negative offset passes it, and prepare_frag() widens the value:\n\n\tunsigned int hlen = skb_network_offset(skb);\n\tmemcpy(&data->l2_data, skb->data, hlen);\n\nwhich is a ~4GiB memcpy out of a 30-byte per-CPU buffer.\n\nReproduced on v7.3-rc1. RDX is the truncated length, (unsigned int)(-8):\n\n  BUG: unable to handle page fault for address: ffffe8ffffc16000\n  #PF: supervisor write access in kernel mode\n  Oops: 0002 [#1] SMP KASAN NOPTI\n  RIP: 0010:memcpy+0x8/0x20\n  RDX: 00000000fffffff8 RSI: ffff888105d732db RDI: ffffe8ffffc16000\n   prepare_frag+0x3df/0x4e0\n   ovs_fragment+0x589/0x7e0\n   do_output+0x4ce/0x5e0\n   do_execute_actions+0x55d2/0x7b30\n   ovs_execute_actions+0xea/0x450\n\nSame root-cause shape as commit 975b5b067f52 (\"ipv6: sr: restore network\nheader before routing and forwarding\"): a stale network header offset\nreaching a consumer that widens it. Here it originates in the MPLS\npush/pop path.\n\nClear inner_protocol once the packet is no longer MPLS, so a later push\nre-records the current header. net/sched/act_mpls.c is the only other\nskb_mpls_pop() caller and gets the same fix; sch_frag.c saves and\nrestores inner_protocol around fragmentation in the same way OVS does.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","source_modified_at":"2026-10-19T09:10:16.030Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"55ed97db27bffe29c21fdefd5d25601322c36ff8","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"833ec2788322306407503b4cfc7745cd1f9d785f","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"0b3425fd0ecd515997956f7bb8a8a576b444ed64","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"011e17b5cae19b9f6a150923275e41c278de64f0","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"b39120523475d6b436be7f6cb27d48064148a327","status":"affected","versionType":"git"},{"version":"48d2ab609b6bbecb7698487c8579bc40de9d6dfa","lessThan":"78a86d75a70e1e227711c72865c59b1422d0a5ae","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","source_modified_at":"2026-10-19T09:10:16.030Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.9","status":"affected"},{"version":"0","lessThan":"4.9","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","source_modified_at":"2026-10-19T09:10:16.030Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"55ed97db27bffe29c21fdefd5d25601322c36ff8","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","source_modified_at":"2026-10-19T09:10:16.030Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"833ec2788322306407503b4cfc7745cd1f9d785f","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","source_modified_at":"2026-10-19T09:10:16.030Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34","basis":"first unaffected version stated in the CVE record"},{"source":"CVE 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record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00164,"percentile":0.05318,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:21.423Z","modified_at":"2026-10-19T09:10:16.030Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97612","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:10:16.030Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97612","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/55ed97db27bffe29c21fdefd5d25601322c36ff8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/833ec2788322306407503b4cfc7745cd1f9d785f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0b3425fd0ecd515997956f7bb8a8a576b444ed64"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/011e17b5cae19b9f6a150923275e41c278de64f0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b39120523475d6b436be7f6cb27d48064148a327"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/78a86d75a70e1e227711c72865c59b1422d0a5ae"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:10:16.030Z","content_hash":"92b2a4bd57cb1b73176ff2acaf5367bfcb7bdfd76735bcbd8d59e2fe02a978d0"}}