{"id":"CVE-2026-72326","state":"PUBLISHED","title":"net/sched: cake: reject overhead values that underflow length","description":"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.","publishedAt":"2026-08-15T05:55:36.811Z","updatedAt":"2026-08-17T05:12:32.814Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"f511dd7bf6077aa7afbe72914520553fedaacbb4","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"297f459865360b46a887667cbf3aac6a6f013841","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"336c1e414fc0e9844d445174e8ada2a7dd8d1c4b","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"bcdf3a3664f7d2c4e37e155f30f72ef33f041804","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"7aa0e64fea778a9e3df73e64da95367ff8ad2ea5","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"f1e7807df5bf2d42a40266430e9f82f37633cdcf","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"b7f97cae7ec1b6c3c32843c42be218690d310467","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_cake.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_cake.c"]}],"references":["https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4","https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f","https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841","https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b","https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804","https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5","https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf","https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72326.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72326","state":"PUBLISHED","datePublished":"2026-08-15T05:55:36.811Z","dateUpdated":"2026-08-17T05:12:32.814Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.919Z"},"containers":{"cna":{"title":"net/sched: cake: reject overhead values that underflow length","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"f511dd7bf6077aa7afbe72914520553fedaacbb4","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"297f459865360b46a887667cbf3aac6a6f013841","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"336c1e414fc0e9844d445174e8ada2a7dd8d1c4b","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"bcdf3a3664f7d2c4e37e155f30f72ef33f041804","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"7aa0e64fea778a9e3df73e64da95367ff8ad2ea5","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"f1e7807df5bf2d42a40266430e9f82f37633cdcf","versionType":"git"},{"version":"a729b7f0bd5bf4919306556aed614438f5174537","status":"affected","lessThan":"b7f97cae7ec1b6c3c32843c42be218690d310467","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_cake.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_cake.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4"},{"url":"https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f"},{"url":"https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841"},{"url":"https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b"},{"url":"https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804"},{"url":"https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5"},{"url":"https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf"},{"url":"https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:12:32.814Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}