CVE-2026-74736

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < ec5a552f4b2d841c6c021752450716e1a9676661affected
LinuxLinux2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < daf546ab5763ce6a18280cb4db060e836c515301affected
LinuxLinux2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < adb3e7c26a51a10d94a241c6de7a81a2863dcacfaffected
LinuxLinux2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5eaffected
LinuxLinux2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 120977e2c096deea4e866e4273be9220b957c29eaffected
LinuxLinux6.3affected
LinuxLinux0 < 6.3unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.46 <= 6.18.*unaffected
LinuxLinux7.1.10 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References