CVE-2026-90373wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f3049b88b2b32326df97461813ae73e8bbc296fc before 5dce25f1d609ba991a9c22c27be586c92f03ed77; from f3049b88b2b32326df97461813ae73e8bbc296fc before b4a41a47a67c788e6b0625fa517ec8872e99bb6c; from f3049b88b2b32326df97461813ae73e8bbc296fc before a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b; from f3049b88b2b32326df97461813ae73e8bbc296fc before 6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba | CNA record |
References
- https://git.kernel.org/stable/c/5dce25f1d609ba991a9c22c27be586c92f03ed77
- https://git.kernel.org/stable/c/b4a41a47a67c788e6b0625fa517ec8872e99bb6c
- https://git.kernel.org/stable/c/a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b
- https://git.kernel.org/stable/c/6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.