bpf: Guard __get_user acesss with access_ok for uprobe_multi data (CVE-2026-74258) | HOL Guard CVE

High · CVSS 7.8CVE-2026-74258

bpf: Guard __get_user acesss with access_ok for uprobe_multi data

Answer in brief

CVE-2026-74258 records a High severity (CVSS 7.8) vulnerability in bpf: Guard __get_user acesss with access_ok for uprobe_multi data. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 15, 2026Updated Sep 21, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Sep 21, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=89ae89f53d201143560f1e9ed4bfa62eee34f88e <c6d51ad36490013ee9df94a372d3bf794bd304d1 \|\| >=89ae89f53d201143560f1e9ed4bfa62eee34f88e <4d87a251d45b4a95eb4c0abcfab809c9f231258a	c6d51ad36490013ee9df94a372d3bf794bd304d1, 4d87a251d45b4a95eb4c0abcfab809c9f231258a
Linux/Linuxgeneric	6.6	Not reported
Linux/Linuxgeneric	>=89ae89f53d201143560f1e9ed4bfa62eee34f88e <2c387db784293256d35fd3d438f577cc82bb823d \|\| >=89ae89f53d201143560f1e9ed4bfa62eee34f88e <a9f1395028c2bbe18e57864cc355c11faff488cb \|\| >=89ae89f53d201143560f1e9ed4bfa62eee34f88e <c6d51ad36490013ee9df94a372d3bf794bd304d1 \|\| >=89ae89f53d201143560f1e9ed4bfa62eee34f88e <4d87a251d45b4a95eb4c0abcfab809c9f231258a	2c387db784293256d35fd3d438f577cc82bb823d, a9f1395028c2bbe18e57864cc355c11faff488cb, c6d51ad36490013ee9df94a372d3bf794bd304d1, 4d87a251d45b4a95eb4c0abcfab809c9f231258a

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c6d51ad36490013ee9df94a372d3bf794bd304d1; Linux/Linux to 2c387db784293256d35fd3d438f577cc82bb823d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard __get_user acesss with access_ok for uprobe_multi data As reported by sashiko [1] we need to use access_ok to check the user space data bounds before we use __get-user to get it. [1] https://lore.kernel.org/bpf/[email protected]/

Quoted source text, attributed separately from HOL analysis.