{"id":"CVE-2026-74704","summary":"net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter\n\nThe sch_cake ACK filter parses packets to find the TCP header and filter\nduplicated ACKs if the flow is backlogged. The parsing code contains a\nWARN_ON(1) which can be triggered by a malformed IP header in certain\ncases. Depending on the system configuration, this leads either to\neither spamming dmesg with warnings, or a panic if panic_on_warn is set.\n\nThe code already correctly skips the offending packet in the branch that\ntriggers the warning, so the WARN_ON itself doesn't really serve any\npurpose. So just drop it altogether to avoid the inconvenient side\neffects.","modified":"2026-08-27T11:30:38.820384472Z","published":"2026-08-22T15:33:03.491Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74704.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74704.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74704"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8b7138814f29933898ecd31dfc83e35a30ee69f5"},{"fixed":"c1693b7844a6c06d31a565e5a494948034dfd235"},{"fixed":"a4b52612004a5639c4bfc30ba93ba414b8326e2a"},{"fixed":"ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3"},{"fixed":"0c4882bff34558d8d53fb04c3e96da5c327c7dc8"},{"fixed":"2504a76e5c0694e14e15562730e1339f2d9f9458"},{"fixed":"cd2f1d9fe8a507c2dc86ad326fe221f121c47734"},{"fixed":"a1ae353d8355407c1bea971d1c1af5e7f242bb7d"},{"fixed":"2a33516f9ef59ad11844d4fc152f889449b5daf3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74704.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.152"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.104"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74704.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"}]}