Riskcovery

CVE-2026-90373

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

State
Published
Severity
Not scored
Published
Sep 17, 2026
Updated
Oct 30, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f3049b88b2b32326df97461813ae73e8bbc296fc to before 5dce25f1d609ba991a9c22c27be586c92f03ed77Affected
  • f3049b88b2b32326df97461813ae73e8bbc296fc to before b4a41a47a67c788e6b0625fa517ec8872e99bb6cAffected
  • f3049b88b2b32326df97461813ae73e8bbc296fc to before a97b2b942d2f8f12fbd6a7caafc735d1ad115e6bAffected
  • f3049b88b2b32326df97461813ae73e8bbc296fc to before 6486e11a6e2f679597af2d5bb48c3b07a2b2a7baAffected
  • b7c8e22dfddacc1b08dbf44f5be2c66305d757bcAffected
  • a582b1d54313dcdc96e7d8e1f49495dd71ddaf3eAffected
  • 6.1.191 to before 6.2Affected
  • 6.6.160 to before 6.7Affected
LinuxLinux
  • 6.12Affected
  • before 6.12Not affected
  • 6.12.110 through 6.12.*Not affected
  • 6.18.52 through 6.18.*Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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