{"id":"CVE-2026-74382","state":"PUBLISHED","title":"net/sched: cls_bpf: prevent unbounded recursion in offload rollback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: prevent unbounded recursion in offload rollback\n\nQuan Sun reported [1] a stack overflow in cls_bpf_offload_cmd().\n\nReproducer on netdevsim: add a skip_sw cls_bpf filter, set the\nbpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace\ncalls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then\nswaps prog/oldprog and recursively calls itself to roll back. But\nbpf_tc_accept=0 makes the rollback fail too, which triggers yet another\nrollback frame with the same arguments, and so on until the stack is\nexhausted.\n\nbpf_tc_accept is just a convenient knob for the reproducer. Any driver\nwhose tc_setup_cb_replace() fails twice in a row can hit the same loop,\nso this is not a netdevsim-only issue.\n\nTwo ways to fix it:\n\n  1) Have the rollback call tc_setup_cb_add() on oldprog instead of\n     re-entering cls_bpf_offload_cmd().\n  2) Mark the rollback frame with a flag and skip a second-level\n     rollback from inside it.\n\nGo with (2). It is the smaller change and keeps the original behaviour:\nthe rollback still goes through tc_setup_cb_replace(), so the driver\ngets one real chance to restore its state. If that attempt also fails,\nwe just return the original error instead of recursing.\n\n[1]: https://lore.kernel.org/bpf/ce5a6005-3c5e-4696-9e05-eba9461dc860@std.uestc.edu.cn/T/#u","publishedAt":"2026-08-15T05:58:59.106Z","updatedAt":"2026-08-17T05:18:20.179Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"a018f208ab7512380bd4cf670064d48cba00a1b1","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"33373e1f378a501bc51aa73312f74295c84e3101","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"4a76953c3ed043797e81529b9395e9ca6f4c7609","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"1387f252a242a51bfbb6eace29c8f8db21b457da","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"10753da2d659dd425a6e620f47f86852d604f67f","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"27db54b90bcc7c37867fe664107fa25ea6a116e4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_bpf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.15","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/cls_bpf.c"]}],"references":["https://git.kernel.org/stable/c/a018f208ab7512380bd4cf670064d48cba00a1b1","https://git.kernel.org/stable/c/33373e1f378a501bc51aa73312f74295c84e3101","https://git.kernel.org/stable/c/e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7","https://git.kernel.org/stable/c/4a76953c3ed043797e81529b9395e9ca6f4c7609","https://git.kernel.org/stable/c/1387f252a242a51bfbb6eace29c8f8db21b457da","https://git.kernel.org/stable/c/10753da2d659dd425a6e620f47f86852d604f67f","https://git.kernel.org/stable/c/3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7","https://git.kernel.org/stable/c/27db54b90bcc7c37867fe664107fa25ea6a116e4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74382.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74382","state":"PUBLISHED","datePublished":"2026-08-15T05:58:59.106Z","dateUpdated":"2026-08-17T05:18:20.179Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.890Z"},"containers":{"cna":{"title":"net/sched: cls_bpf: prevent unbounded recursion in offload rollback","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: prevent unbounded recursion in offload rollback\n\nQuan Sun reported [1] a stack overflow in cls_bpf_offload_cmd().\n\nReproducer on netdevsim: add a skip_sw cls_bpf filter, set the\nbpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace\ncalls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then\nswaps prog/oldprog and recursively calls itself to roll back. But\nbpf_tc_accept=0 makes the rollback fail too, which triggers yet another\nrollback frame with the same arguments, and so on until the stack is\nexhausted.\n\nbpf_tc_accept is just a convenient knob for the reproducer. Any driver\nwhose tc_setup_cb_replace() fails twice in a row can hit the same loop,\nso this is not a netdevsim-only issue.\n\nTwo ways to fix it:\n\n  1) Have the rollback call tc_setup_cb_add() on oldprog instead of\n     re-entering cls_bpf_offload_cmd().\n  2) Mark the rollback frame with a flag and skip a second-level\n     rollback from inside it.\n\nGo with (2). It is the smaller change and keeps the original behaviour:\nthe rollback still goes through tc_setup_cb_replace(), so the driver\ngets one real chance to restore its state. If that attempt also fails,\nwe just return the original error instead of recursing.\n\n[1]: https://lore.kernel.org/bpf/ce5a6005-3c5e-4696-9e05-eba9461dc860@std.uestc.edu.cn/T/#u"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"a018f208ab7512380bd4cf670064d48cba00a1b1","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"33373e1f378a501bc51aa73312f74295c84e3101","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"4a76953c3ed043797e81529b9395e9ca6f4c7609","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"1387f252a242a51bfbb6eace29c8f8db21b457da","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"10753da2d659dd425a6e620f47f86852d604f67f","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7","versionType":"git"},{"version":"102740bd9436a3a6ba129af3a48271d794009fa5","status":"affected","lessThan":"27db54b90bcc7c37867fe664107fa25ea6a116e4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_bpf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.15","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/cls_bpf.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a018f208ab7512380bd4cf670064d48cba00a1b1"},{"url":"https://git.kernel.org/stable/c/33373e1f378a501bc51aa73312f74295c84e3101"},{"url":"https://git.kernel.org/stable/c/e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7"},{"url":"https://git.kernel.org/stable/c/4a76953c3ed043797e81529b9395e9ca6f4c7609"},{"url":"https://git.kernel.org/stable/c/1387f252a242a51bfbb6eace29c8f8db21b457da"},{"url":"https://git.kernel.org/stable/c/10753da2d659dd425a6e620f47f86852d604f67f"},{"url":"https://git.kernel.org/stable/c/3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7"},{"url":"https://git.kernel.org/stable/c/27db54b90bcc7c37867fe664107fa25ea6a116e4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:18:20.179Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}