{"id":"CVE-2026-97612","revision":"12bf979bc2474dc79a1321f9a7f9c351","records":[{"revision":"12bf979bc2474dc79a1321f9a7f9c351","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97612","aliases":[],"title":"net: mpls: clear inner_protocol when the last label is popped","description":"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.","state":0,"publishedAt":"2026-09-25T10:22:21.423+00:00","modifiedAt":"2026-10-19T09:10:16.03+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/skbuff.c\"\n ],\n \"versions\": [\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"55ed97db27bffe29c21fdefd5d25601322c36ff8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"833ec2788322306407503b4cfc7745cd1f9d785f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"0b3425fd0ecd515997956f7bb8a8a576b444ed64\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"011e17b5cae19b9f6a150923275e41c278de64f0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"b39120523475d6b436be7f6cb27d48064148a327\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"48d2ab609b6bbecb7698487c8579bc40de9d6dfa\",\n \"lessThan\": \"78a86d75a70e1e227711c72865c59b1422d0a5ae\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/skbuff.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.9\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.9\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.271\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.222\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.158\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.111\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.53\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.7\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/55ed97db27bffe29c21fdefd5d25601322c36ff8","https://git.kernel.org/stable/c/833ec2788322306407503b4cfc7745cd1f9d785f","https://git.kernel.org/stable/c/38db09804b2616aa1e2fcdf97f0c3ae8b9dbdd34","https://git.kernel.org/stable/c/0b3425fd0ecd515997956f7bb8a8a576b444ed64","https://git.kernel.org/stable/c/011e17b5cae19b9f6a150923275e41c278de64f0","https://git.kernel.org/stable/c/da8c3a7f5d3137fec4ff60a6248f5f6d66b6a63e","https://git.kernel.org/stable/c/b39120523475d6b436be7f6cb27d48064148a327","https://git.kernel.org/stable/c/78a86d75a70e1e227711c72865c59b1422d0a5ae"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97612","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97612","identifiers":["CVE-2026-97612"]},"retained":false,"historicalAffected":[]}],"coverage":[]}