bpf: Keep dynamic inner array lookups nullable

Answer in brief

CVE-2026-64353 records a Medium severity (CVSS 5.5) vulnerability in bpf: Keep dynamic inner array lookups nullable. 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 Jul 25, 2026Updated Sep 3, 2026Source checked Oct 1, 2026First seen by HOL Aug 11, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. 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.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d2102f2f5d75a84dbab6ff890359f0bd4a18ca22 <0b92ad64d6e4bde85e6b9888404f9a7a2b65d269 \|\| >=d2102f2f5d75a84dbab6ff890359f0bd4a18ca22 <d57db0d975053e01410c54e708a85b6d32ef2ebd \|\| >=d2102f2f5d75a84dbab6ff890359f0bd4a18ca22 <53040a81ae57cdca8af8ac36fe4e661730cf7c6b	0b92ad64d6e4bde85e6b9888404f9a7a2b65d269, d57db0d975053e01410c54e708a85b6d32ef2ebd, 53040a81ae57cdca8af8ac36fe4e661730cf7c6b
Linux/Linuxgeneric	6.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0b92ad64d6e4bde85e6b9888404f9a7a2b65d269 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Keep dynamic inner array lookups nullable An ARRAY_OF_MAPS can use an array created with BPF_F_INNER_MAP as its inner map template. A concrete inner array with a different max_entries value can then replace the template. After a successful outer map lookup, the verifier represents the resulting map pointer using the inner map template. Const-key lookup nullness elision consequently uses the template max_entries even though the runtime helper uses the concrete inner map max_entries. Do not elide lookup result nullness for maps marked with BPF_F_INNER_MAP, because the template max_entries does not prove that the key is in bounds for the concrete runtime map.

Quoted source text, attributed separately from HOL analysis.