net/sched: cls_bpf: prevent unbounded recursion in offload rollback

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Summary

CVECVE-2026-74382
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:40 UTC
Updated2026-08-15 06:22:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: prevent unbounded recursion in offload rollback Quan Sun reported [1] a stack overflow in cls_bpf_offload_cmd(). Reproducer on netdevsim: add a skip_sw cls_bpf filter, set the bpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace calls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then swaps prog/oldprog and recursively calls itself to roll back. But bpf_tc_accept=0 makes the rollback fail too, which triggers yet another rollback frame with the same arguments, and so on until the stack is exhausted. bpf_tc_accept is just a convenient knob for the reproducer. Any driver whose tc_setup_cb_replace() fails twice in a row can hit the same loop, so this is not a netdevsim-only issue. Two ways to fix it: 1) Have the rollback call tc_setup_cb_add() on oldprog instead of re-entering cls_bpf_offload_cmd(). 2) Mark the rollback frame with a flag and skip a second-level rollback from inside it. Go with (2). It is the smaller change and keeps the original behaviour: the rollback still goes through tc_setup_cb_replace(), so the driver gets one real chance to restore its state. If that attempt also fails, we just return the original error instead of recursing. [1]: https://lore.kernel.org/bpf/[email protected]/T/#u

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 a018f208ab7512380bd4cf670064d48cba00a1b1 git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 33373e1f378a501bc51aa73312f74295c84e3101 git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7 git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 4a76953c3ed043797e81529b9395e9ca6f4c7609 git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 1387f252a242a51bfbb6eace29c8f8db21b457da git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 10753da2d659dd425a6e620f47f86852d604f67f git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7 git Not specified
CNA Linux Linux affected 102740bd9436a3a6ba129af3a48271d794009fa5 27db54b90bcc7c37867fe664107fa25ea6a116e4 git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a018f208ab7512380bd4cf670064d48cba00a1b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/27db54b90bcc7c37867fe664107fa25ea6a116e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a76953c3ed043797e81529b9395e9ca6f4c7609 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1387f252a242a51bfbb6eace29c8f8db21b457da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33373e1f378a501bc51aa73312f74295c84e3101 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10753da2d659dd425a6e620f47f86852d604f67f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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