{"api_version":"1","generated_at":"2026-09-04T01:59:50+00:00","cve":"CVE-2026-80733","urls":{"html":"https://cve.report/CVE-2026-80733","api":"https://cve.report/api/cve/CVE-2026-80733.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80733","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80733"},"summary":{"title":"net: remove WARN_ON_ONCE() from sk_mc_loop()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-03 13:06:12","updated_at":"2026-09-03 13:06:12"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718","name":"https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18","name":"https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496","name":"https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0","name":"https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f","name":"https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe","name":"https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c","name":"https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c","name":"https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80733","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80733","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 97133c4d42654578fab95abe47359ebe784dde18 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 f625c742b33dc137c209dd13d1c5f12b1c18d71c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 ad7fa2f411cb30f63d6725f111be134064cdb718 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 d2adc4e80b29e58b5162ae09f0f657a215806c8c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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3fe207e4637a2e792c46a08666aa722f77d7f8f7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14.40 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.18.13 3.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.19.6 3.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.265 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80733","cve":"CVE-2026-80733","epss":"0.002100000","percentile":"0.111730000","score_date":"2026-09-03","updated_at":"2026-09-04 00:08:04"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/core/sock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"97133c4d42654578fab95abe47359ebe784dde18","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"f625c742b33dc137c209dd13d1c5f12b1c18d71c","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"ad7fa2f411cb30f63d6725f111be134064cdb718","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"d2adc4e80b29e58b5162ae09f0f657a215806c8c","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"c8f256dc849205ccb2bd78bd99a3497b972b44e0","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"lessThan":"b8a39a09ae4eaae04309e1e38ed6a1101d967496","status":"affected","version":"f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90","versionType":"git"},{"status":"affected","version":"c91f81773cd4bbebfe744e9ab30a7ce093f9b930","versionType":"git"},{"status":"affected","version":"c8c30b2b17f2133e953850c547e3902c3a3d80e2","versionType":"git"},{"status":"affected","version":"3fe207e4637a2e792c46a08666aa722f77d7f8f7","versionType":"git"},{"lessThan":"3.15","status":"affected","version":"3.14.40","versionType":"semver"},{"lessThan":"3.19","status":"affected","version":"3.18.13","versionType":"semver"},{"lessThan":"3.20","status":"affected","version":"3.19.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/core/sock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.0"},{"lessThan":"4.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.265","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14.40","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning."}],"providerMetadata":{"dateUpdated":"2026-09-03T08:21:50.136Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18"},{"url":"https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c"},{"url":"https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718"},{"url":"https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c"},{"url":"https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"},{"url":"https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0"},{"url":"https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"},{"url":"https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"}],"title":"net: remove WARN_ON_ONCE() from sk_mc_loop()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80733","datePublished":"2026-09-03T08:21:50.136Z","dateReserved":"2026-08-26T14:34:25.789Z","dateUpdated":"2026-09-03T08:21:50.136Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-03 13:06:12","lastModifiedDate":"2026-09-03 13:06:12","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80733","Ordinal":"1","Title":"net: remove WARN_ON_ONCE() from sk_mc_loop()","CVE":"CVE-2026-80733","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80733","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.","Type":"Description","Title":"net: remove WARN_ON_ONCE() from sk_mc_loop()"}]}}}