net/sched: cls_bpf: reject dev-bound programs bound to a different device (CVE-2026-74736) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74736

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

Answer in brief

CVE-2026-74736 records a Unknown severity vulnerability in net/sched: cls_bpf: reject dev-bound programs bound to a different device. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <ec5a552f4b2d841c6c021752450716e1a9676661 \|\| >=2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <daf546ab5763ce6a18280cb4db060e836c515301 \|\| >=2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <adb3e7c26a51a10d94a241c6de7a81a2863dcacf \|\| >=2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e \|\| >=2b3486bc2d237ec345b3942b7be5deabf8c8fed1 <120977e2c096deea4e866e4273be9220b957c29e	ec5a552f4b2d841c6c021752450716e1a9676661, daf546ab5763ce6a18280cb4db060e836c515301, adb3e7c26a51a10d94a241c6de7a81a2863dcacf, 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e, 120977e2c096deea4e866e4273be9220b957c29e
Linux/Linuxgeneric	6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ec5a552f4b2d841c6c021752450716e1a9676661 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.