bpf: reject BPF_PSEUDO_FUNC reference to the main program (CVE-2026-98075) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-98075

bpf: reject BPF_PSEUDO_FUNC reference to the main program

Answer in brief

CVE-2026-98075 records a Unknown severity vulnerability in bpf: reject BPF_PSEUDO_FUNC reference to the main program. 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	>=69c087ba6225b574afb6e505b72cb75242a3d844 <118212417ba0120d99f84154799f8880f07411f4 \|\| >=69c087ba6225b574afb6e505b72cb75242a3d844 <d6c39774ae093c9f7009cc4ae918f18fc1af7ae7 \|\| >=69c087ba6225b574afb6e505b72cb75242a3d844 <92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6 \|\| >=69c087ba6225b574afb6e505b72cb75242a3d844 <374b2c5561db80fcdd7cdce44af37a49416f61c7	118212417ba0120d99f84154799f8880f07411f4, d6c39774ae093c9f7009cc4ae918f18fc1af7ae7, 92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6, 374b2c5561db80fcdd7cdce44af37a49416f61c7
Linux/Linuxgeneric	5.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 118212417ba0120d99f84154799f8880f07411f4 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: reject BPF_PSEUDO_FUNC reference to the main program fixups.c:jit_subprogs() rewrites BPF_PSEUDO_FUNC loads to contain real function addresses. This function is invoked from bpf_jit_subprogs() only when env->subprog_cnt > 1. Meaning that for any program like below: int main(void *ctx) { void *ptr = main; ... bpf_timer_set_callback(..., ptr); ... } The 'ptr' won't be ever converted to contain an address. In combination with e.g. bpf_timer_set_callback() this would lead to a function call at a bogus address. Instead of complicating the implementation, just assume that no useful program needs main to be a sync or async callback and reject BPF_PSEUDO_FUNC loads for the main subprogram.

Quoted source text, attributed separately from HOL analysis.