CVE-2026-74736
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: reject dev-bound programs bound to a different device cls_bpf_prog_from_efd() obtained a SCHED_CLS program via bpf_prog_get_type_dev() but never verified that a device-bound (offloaded) program's bound netdev matches the TC netdev the classifier is being attached to. This let a program loaded with prog_ifindex for device A be attached via cls_bpf + skip_sw to device B; deleting device A then destroyed the program's offload state while it was still attached to device B, triggering a netdevsim WARN (panic with panic_on_warn=1). Mirror the XDP attach path (net/core/dev.c) and reject the attach with -EINVAL when a dev-bound program's bound device does not match the target device.
How to fix
- Linux Linuxec5a552f4b2d841c6c021752450716e1a9676661, daf546ab5763ce6a18280cb4db060e836c515301, adb3e7c26a51a10d94a241c6de7a81a2863dcacf, 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e, 120977e2c096deea4e866e4273be9220b957c29e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ≤ v < ec5a552f4b2d841c6c021752450716e1a9676661, 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ≤ v < daf546ab5763ce6a18280cb4db060e836c515301, 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ≤ v < adb3e7c26a51a10d94a241c6de7a81a2863dcacf, 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ≤ v < 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e, 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ≤ v < 120977e2c096deea4e866e4273be9220b957c29e, 6.3 | ec5a552f4b2d841c6c021752450716e1a9676661, daf546ab5763ce6a18280cb4db060e836c515301, adb3e7c26a51a10d94a241c6de7a81a2863dcacf, 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e, 120977e2c096deea4e866e4273be9220b957c29e |
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