bpf: Preserve unique-field state across nested structs (CVE-2026-92515) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92515

bpf: Preserve unique-field state across nested structs

Answer in brief

CVE-2026-92515 records a Unknown severity vulnerability in bpf: Preserve unique-field state across nested structs. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=64e8ee814819f21beeeda00d4119221443d77992 <cec97102d4147e18568c93946014c4c8ebf86fcf \|\| >=64e8ee814819f21beeeda00d4119221443d77992 <28d5f20ed022ade0fb0bfbf50b78fec782083175 \|\| >=64e8ee814819f21beeeda00d4119221443d77992 <373a1e9366e711b89bc5e45bd6edf33ef62402cd \|\| >=64e8ee814819f21beeeda00d4119221443d77992 <f08619f060468076e4acbdc10e0713af20d60e65	cec97102d4147e18568c93946014c4c8ebf86fcf, 28d5f20ed022ade0fb0bfbf50b78fec782083175, 373a1e9366e711b89bc5e45bd6edf33ef62402cd, f08619f060468076e4acbdc10e0713af20d60e65
Linux/Linuxgeneric	6.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to cec97102d4147e18568c93946014c4c8ebf86fcf if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve unique-field state across nested structs btf_find_struct_field() initializes a fresh seen mask for every recursive descent. Unique special fields in different levels of the same aggregate therefore do not see one another. The duplicate fields can reach btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A crafted user BTF can consequently trigger the warning before map creation checks capabilities. Initialize the seen mask once in btf_find_field() and pass the same pointer through struct, datasec, and nested-struct walks. This gives the entire field traversal one shared uniqueness state.

Quoted source text, attributed separately from HOL analysis.