---
id: CVE-2026-74736
title: 'net/sched: cls_bpf: reject dev-bound programs bound to a different device'
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 ve…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <
    ec5a552f4b2d841c6c021752450716e1a9676661
  - >-
    Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <
    daf546ab5763ce6a18280cb4db060e836c515301
  - >-
    Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <
    adb3e7c26a51a10d94a241c6de7a81a2863dcacf
  - >-
    Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <
    5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e
  - >-
    Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <
    120977e2c096deea4e866e4273be9220b957c29e
  - Linux 6.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:15:56.417878Z'
published: '2026-08-26'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:16:12.701Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74736'
references:
  - url: 'https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661'
  - url: 'https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301'
  - url: 'https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf'
  - url: 'https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e'
  - url: 'https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e'
tags:
  - cve.org
epss: 0.00138
epssPercentile: 0.02841
ingestedAt: '2026-10-16T19:46:24.328Z'
---

## Overview

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

- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < ec5a552f4b2d841c6c021752450716e1a9676661`
- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < daf546ab5763ce6a18280cb4db060e836c515301`
- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < adb3e7c26a51a10d94a241c6de7a81a2863dcacf`
- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e`
- `Linux >= 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 < 120977e2c096deea4e866e4273be9220b957c29e`
- `Linux 6.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.