{"id":"CVE-2026-74382","title":"net/sched: cls_bpf: prevent unbounded recursion in offload rollback","summary":"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 sk…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < a018f208ab7512380bd4cf670064d48cba00a1b1","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 33373e1f378a501bc51aa73312f74295c84e3101","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 4a76953c3ed043797e81529b9395e9ca6f4c7609","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 1387f252a242a51bfbb6eace29c8f8db21b457da","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 10753da2d659dd425a6e620f47f86852d604f67f","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7","Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 27db54b90bcc7c37867fe664107fa25ea6a116e4","Linux 4.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:56:47.875311Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:45.139Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74382","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"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.09248,"ingestedAt":"2026-11-06T18:00:12.561Z","slug":"CVE-2026-74382","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < a018f208ab7512380bd4cf670064d48cba00a1b1`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 33373e1f378a501bc51aa73312f74295c84e3101`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 4a76953c3ed043797e81529b9395e9ca6f4c7609`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 1387f252a242a51bfbb6eace29c8f8db21b457da`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 10753da2d659dd425a6e620f47f86852d604f67f`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7`\n- `Linux >= 102740bd9436a3a6ba129af3a48271d794009fa5 < 27db54b90bcc7c37867fe664107fa25ea6a116e4`\n- `Linux 4.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}