wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear (CVE-2026-90373) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90373

wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear

Answer in brief

CVE-2026-90373 records a Unknown severity vulnerability in wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear. 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	>=f3049b88b2b32326df97461813ae73e8bbc296fc <5dce25f1d609ba991a9c22c27be586c92f03ed77 \|\| >=f3049b88b2b32326df97461813ae73e8bbc296fc <b4a41a47a67c788e6b0625fa517ec8872e99bb6c \|\| >=f3049b88b2b32326df97461813ae73e8bbc296fc <a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b \|\| >=f3049b88b2b32326df97461813ae73e8bbc296fc <6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba	5dce25f1d609ba991a9c22c27be586c92f03ed77, b4a41a47a67c788e6b0625fa517ec8872e99bb6c, a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b, 6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5dce25f1d609ba991a9c22c27be586c92f03ed77 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: mt7915: clear wcid mask under mutex after RCU pointer clear mt7915_remove_interface() cleared the wcid mask bit with no lock held and before clearing the RCU wcid pointer. The mask is a non-atomic RMW shared with the allocators, which all run under dev->mt76.mutex; on DBDC the two wiphys share one mt76_dev, so this raced add_interface/sta_add on the other band and could leak or double-hand-out a wcid. Clearing the bit before the RCU pointer also let a concurrent allocation reuse the index and publish its wcid, which the subsequent NULL assignment then wiped. Move the clear into the existing mutex section, after the RCU pointer is cleared.

Quoted source text, attributed separately from HOL analysis.