Unknown severity · Source severity not reportedCVE-2026-98611

bpf: Check params size before reading reserved fieldsCVE-2026-98611

Answer in brief

CVE-2026-98611 records a Unknown severity vulnerability in bpf: Check params size before reading reserved fields. 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 Oct 18, 2026Updated Oct 19, 2026Source checked Oct 25, 2026First seen by HOL Oct 18, 2026Material review Oct 19, 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	>=3e1c6f35409f9e447bf37f64840f5b65576bfb78 <e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a \|\| >=3e1c6f35409f9e447bf37f64840f5b65576bfb78 <cd12d3e08620257fbcaa262785d7f4b9473afc7a \|\| >=3e1c6f35409f9e447bf37f64840f5b65576bfb78 <86a0e945fb645ea90233fde239cd2de79f01974c \|\| >=3e1c6f35409f9e447bf37f64840f5b65576bfb78 <a11212910cf09b2fe8db9afa41ef60c4f81879c5	e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a, cd12d3e08620257fbcaa262785d7f4b9473afc7a, 86a0e945fb645ea90233fde239cd2de79f01974c, a11212910cf09b2fe8db9afa41ef60c4f81879c5
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 18, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: bpf: Check params size before reading reserved fields bpf_crypto_ctx_create() is a kfunc whose second argument is declared with the __sz annotation, so the verifier only guarantees that params__sz bytes of params are valid. The function nevertheless reads params->reserved[0] and params->reserved[1] (offsets 14 and 15) before comparing params__sz against the size of struct bpf_crypto_params, so a BPF program can pass a shorter buffer and have the kernel read past the region that was validated for it. Move the size check in front of the reserved field reads.

Quoted source text, attributed separately from HOL analysis.