bpf: Mark faultable stack helpers as sleepable

Answer in brief

CVE-2026-98045 records a Unknown severity vulnerability in bpf: Mark faultable stack helpers as sleepable. 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 Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 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	>=d4dd9775ec242425576af93daadb80a34083a53c <44b8d370f2725bad215da3e67668e98ba96671bd \|\| >=d4dd9775ec242425576af93daadb80a34083a53c <3014e8a8bdad55075d89836ad9c10710a9a69837 \|\| >=d4dd9775ec242425576af93daadb80a34083a53c <19e8d5a98afd071d8c1c5adeccf92b3c42eddc70 \|\| >=d4dd9775ec242425576af93daadb80a34083a53c <9d02927fdf4e930893c92e35fed01a2704496900	44b8d370f2725bad215da3e67668e98ba96671bd, 3014e8a8bdad55075d89836ad9c10710a9a69837, 19e8d5a98afd071d8c1c5adeccf92b3c42eddc70, 9d02927fdf4e930893c92e35fed01a2704496900
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 44b8d370f2725bad215da3e67668e98ba96671bd if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark faultable stack helpers as sleepable The faultable variants of bpf_get_stack() and bpf_get_task_stack() pass may_fault=true into the common stack collection code. Resolving user-space build IDs may then call build_id_parse_file() and block on filesystem reads. Neither helper prototype sets might_sleep. Since prototype selection uses the sleepability of the whole program, the verifier can still allow these helpers from a non-sleepable region within that program, such as an explicit RCU or preemption-disabled region. The task-stack helper can also be called from a non-sleepable timer callback of a sleepable program. Mark both faultable prototypes as sleepable. The existing helper context check then rejects these calls while continuing to allow them in genuinely sleepable contexts.

Quoted source text, attributed separately from HOL analysis.