{"id":"CVE-2026-46306","revision":null,"records":[{"revision":"f122516355b74fa89a2c35b73dcd5efc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46306","aliases":[],"title":"flow_dissector: do not dissect PPPoE PFC frames","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nflow_dissector: do not dissect PPPoE PFC frames\n\nRFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT\nRECOMMENDED for PPPoE. In practice, pppd does not support negotiating\nPFC for PPPoE sessions, and the flow dissector driver has assumed an\nuncompressed frame until the blamed commit.\n\nDuring the review process of that commit [1], support for PFC is\nsuggested. However, having a compressed (1-byte) protocol field means\nthe subsequent PPP payload is shifted by one byte, causing 4-byte\nmisalignment for the network header and an unaligned access exception\non some architectures.\n\nThe exception can be reproduced by sending a PPPoE PFC frame to an\nethernet interface of a MIPS board, with RPS enabled, even if no PPPoE\nsession is active on that interface:\n\n$ 0 : 00000000 80c40000 00000000 85144817\n$ 4 : 00000008 00000100 80a75758 81dc9bb8\n$ 8 : 00000010 8087ae2c 0000003d 00000000\n$12 : 000000e0 00000039 00000000 00000000\n$16 : 85043240 80a75758 81dc9bb8 00006488\n$20 : 0000002f 00000007 85144810 80a70000\n$24 : 81d1bda0 00000000\n$28 : 81dc8000 81dc9aa8 00000000 805ead08\nHi : 00009d51\nLo : 2163358a\nepc : 805e91f0 __skb_flow_dissect+0x1b0/0x1b50\nra : 805ead08 __skb_get_hash_net+0x74/0x12c\nStatus: 11000403 KERNEL EXL IE\nCause : 40800010 (ExcCode 04)\nBadVA : 85144817\nPrId : 0001992f (MIPS 1004Kc)\nCall Trace:\n[<805e91f0>] __skb_flow_dissect+0x1b0/0x1b50\n[<805ead08>] __skb_get_hash_net+0x74/0x12c\n[<805ef330>] get_rps_cpu+0x1b8/0x3fc\n[<805fca70>] netif_receive_skb_list_internal+0x324/0x364\n[<805fd120>] napi_complete_done+0x68/0x2a4\n[<8058de5c>] mtk_napi_rx+0x228/0xfec\n[<805fd398>] __napi_poll+0x3c/0x1c4\n[<805fd754>] napi_threaded_poll_loop+0x234/0x29c\n[<805fd848>] napi_threaded_poll+0x8c/0xb0\n[<80053544>] kthread+0x104/0x12c\n[<80002bd8>] ret_from_kernel_thread+0x14/0x1c\n\nCode: 02d51821 1060045b 00000000 <8c640000> 3084000f 2c820005 144001a2 00042080 8e220000\n\nTo reduce the attack surface and maintain performance, do not process\nPPPoE PFC frames.\n\n[1] https://lore.kernel.org/r/20220630231016.GA392@debian.home","state":0,"publishedAt":"2026-06-08T15:46:33.936+00:00","modifiedAt":"2026-10-19T19:36:57.372+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/flow_dissector.c\"\n ],\n \"versions\": [\n {\n \"version\": \"10f665b52a75df6eb26ddebbbc072ee264183731\",\n \"lessThan\": \"e7c811ca372d53c2be7d01a1614e71fae1054836\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d7e541e86122d21f71eb71c5dfa7fb1eb6623fe8\",\n \"lessThan\": \"abc5bc84e0f2edc7ea2d437afa6ef3fe1fc43200\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"db104b0d8a7856397c0469d83a4289adf7c54863\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"6044392d9cace3a3672b02c8bc7d38b502e51734\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"0d00b9015069712944934bab09eaa6c542143049\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"7c93f353eab4ea911e394630f07d72e040a729d8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"46126db9c86110e5fc1e369b9bb89735ddefdae4\",\n \"lessThan\": \"d6c19b31a3c1d519fabdcf0aa239e6b6109b9473\",\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/flow_dissector.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.140\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.88\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.30\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.7\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/e7c811ca372d53c2be7d01a1614e71fae1054836","https://git.kernel.org/stable/c/abc5bc84e0f2edc7ea2d437afa6ef3fe1fc43200","https://git.kernel.org/stable/c/18ae9eacfc95cc715c0606b2c86e8aa8a86cf3e3","https://git.kernel.org/stable/c/db104b0d8a7856397c0469d83a4289adf7c54863","https://git.kernel.org/stable/c/6044392d9cace3a3672b02c8bc7d38b502e51734","https://git.kernel.org/stable/c/0d00b9015069712944934bab09eaa6c542143049","https://git.kernel.org/stable/c/7c93f353eab4ea911e394630f07d72e040a729d8","https://git.kernel.org/stable/c/d6c19b31a3c1d519fabdcf0aa239e6b6109b9473"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46306","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46306","identifiers":["CVE-2026-46306"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-08T19:47:20.1649891+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T19:47:20.1649891+00:00","lastSuccessAt":"2026-11-08T19:47:20.3951142+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:20.3951146+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-3b79c659b4ac42b2801e63ff6ff3a882","complete":false,"records":13666,"lastAttemptAt":"2026-11-08T19:47:46.1695591+00:00","lastSuccessAt":"2026-11-08T19:47:46.166+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:46.166+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13206,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-08T19:47:20.0165357+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:20.0165357+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-08T19:47:19.7560084+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:19.7560084+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-964c14035e6f0f6478b2870fad6a7ef9f6045876d4a12af2c2e514521e54b6af","complete":true,"records":3055,"lastAttemptAt":"2026-11-08T19:47:20.1181272+00:00","lastSuccessAt":"2026-11-08T11:07:12.1927025+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:20.1181272+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-f8647d7ba64b1ba0dfdc7130944766d5b36d5b77d18fff0c79e651a4cff3c2b9","complete":true,"records":231293,"lastAttemptAt":"2026-11-08T19:47:19.9161497+00:00","lastSuccessAt":"2026-11-08T11:06:56.2918717+00:00","error":null,"lastVerifiedAt":"2026-11-08T19:47:19.9161497+00:00","snapshotPublishedAt":"2026-11-08T11:02:50+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}