wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV (CVE-2026-90366) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90366

wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

Answer in brief

CVE-2026-90366 records a Unknown severity vulnerability in wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV. 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	>=98686cd21624c75a043e96812beadddf4f6f48e5 <1d348f96623ec20d700af7d4dfc00a74da6238ac \|\| >=98686cd21624c75a043e96812beadddf4f6f48e5 <bc1d694a1ffe0062c3adf0db1d64ad54454398ec \|\| >=98686cd21624c75a043e96812beadddf4f6f48e5 <45d8896e4cffffb2c6554ccbec6efe7a0d53166f \|\| >=98686cd21624c75a043e96812beadddf4f6f48e5 <1a51aff0e048dc5b8252d65808b79939c942d6ec \|\| >=98686cd21624c75a043e96812beadddf4f6f48e5 <50c66bab321140c49aa2ed779a3ec9d2f085b458	1d348f96623ec20d700af7d4dfc00a74da6238ac, bc1d694a1ffe0062c3adf0db1d64ad54454398ec, 45d8896e4cffffb2c6554ccbec6efe7a0d53166f, 1a51aff0e048dc5b8252d65808b79939c942d6ec, 50c66bab321140c49aa2ed779a3ec9d2f085b458
Linux/Linuxgeneric	6.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 1d348f96623ec20d700af7d4dfc00a74da6238ac 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: wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a near-maximum beacon template the extra 8 bytes could push the offload command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic(). Reserve room for both countdown TLVs.

Quoted source text, attributed separately from HOL analysis.