{"id":"CVE-2026-72326","summary":"net/sched: cake: reject overhead values that underflow length","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cake: reject overhead values that underflow length\n\nCAKE accepts signed overhead values and stores them in an s16, but the\nadjusted packet length calculation uses unsigned arithmetic.  A negative\neffective length can therefore wrap to a large value.\n\nSuch configurations make rate accounting depend on integer wraparound\nrather than on the packet size userspace intended to model.  A static\nnetlink lower bound is not enough because packets reaching CAKE can be\nsmaller than any reasonable manual-overhead allowance.\n\nFold the signed overhead adjustment into the existing datapath MPU clamp\nso negative adjusted lengths are clamped before link-layer framing\nadjustments.","modified":"2026-08-18T03:30:57.534182398Z","published":"2026-08-15T05:55:36.811Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72326.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841"},{"type":"WEB","url":"https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72326.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72326"},{"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":"a729b7f0bd5bf4919306556aed614438f5174537"},{"fixed":"f511dd7bf6077aa7afbe72914520553fedaacbb4"},{"fixed":"e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f"},{"fixed":"297f459865360b46a887667cbf3aac6a6f013841"},{"fixed":"336c1e414fc0e9844d445174e8ada2a7dd8d1c4b"},{"fixed":"bcdf3a3664f7d2c4e37e155f30f72ef33f041804"},{"fixed":"7aa0e64fea778a9e3df73e64da95367ff8ad2ea5"},{"fixed":"f1e7807df5bf2d42a40266430e9f82f37633cdcf"},{"fixed":"b7f97cae7ec1b6c3c32843c42be218690d310467"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72326.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72326.json"}}],"schema_version":"1.9.0"}