CVE-2026-74736

net/sched: cls_bpf: reject dev-bound programs bound to a different device

State: Published
Severity: 7.8 High
Published: Aug 26, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before ec5a552f4b2d841c6c021752450716e1a9676661Affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before daf546ab5763ce6a18280cb4db060e836c515301Affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before adb3e7c26a51a10d94a241c6de7a81a2863dcacfAffected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5eAffected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before 120977e2c096deea4e866e4273be9220b957c29eAffected
LinuxLinux	6.3Affected before 6.3Not affected 6.6.153 through 6.6.Not affected 6.12.105 through 6.12.Not affected 6.18.46 through 6.18.Not affected 7.1.10 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before ec5a552f4b2d841c6c021752450716e1a9676661Affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before daf546ab5763ce6a18280cb4db060e836c515301Affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before adb3e7c26a51a10d94a241c6de7a81a2863dcacfAffected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5eAffected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1 to before 120977e2c096deea4e866e4273be9220b957c29eAffected

LinuxLinux

6.3Affected
before 6.3Not affected
6.6.153 through 6.6.*Not affected
6.12.105 through 6.12.*Not affected
6.18.46 through 6.18.*Not affected
7.1.10 through 7.1.*Not affected
7.2 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.