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CVE-2026-74382: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In 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

    Засегнати продукти

    • Linux Linux: 102740bd9436a3a6ba129af3a48271d794009fa5 преди a018f208ab7512380bd4cf670064d48cba00a1b1; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 33373e1f378a501bc51aa73312f74295c84e3101; 102740bd9436a3a6ba129af3a48271d794009fa5 преди e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 4a76953c3ed043797e81529b9395e9ca6f4c7609; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 1387f252a242a51bfbb6eace29c8f8db21b457da; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 10753da2d659dd425a6e620f47f86852d604f67f; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7; 102740bd9436a3a6ba129af3a48271d794009fa5 преди 27db54b90bcc7c37867fe664107fa25ea6a116e4
    • Linux Linux: 4.15; преди 4.15; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    Първоизточници

    CVE-2026-74382: Linux | freedomonline.bg