Linux Kernel: mt76 mt7921 AID Overflow NIM Firmware Crash
CVE-2026-53317 Published on June 26, 2026
wifi: mt76: mt7921: Place upper limit on station AID
In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7921: Place upper limit on station AID
Any station configured with an AID over 20 causes a firmware crash.
This situation occurred in our testing using an AP interface on 7922
hardware, with a modified hostapd, sourced from Mediatek's OpenWRT
feeds.
In stock hostapd, station AIDs begin counting at 1, and this
configuration is prevented with an upper limit on associated stations.
However, the modified hostapd began allocation at 65, which caused the
firmware to crash. This fix does not allow these AIDs to work, but will
prevent the firmware crash.
This crash was only seen on IFTYPE_AP interfaces, and the fix does not
appear to have an effect on IFTYPE_STATION behavior.
Products Associated with CVE-2026-53317
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Affected Versions
Linux:- Version 5c14a5f944b91371961548b1907802f74a4d2e5c and below 6dbe70f9ef14d8ac1c24bf19fd9510978a3ab952 is affected.
- Version 5c14a5f944b91371961548b1907802f74a4d2e5c and below 35835ff71e6e618155578b8e3905597edd5f601c is affected.
- Version 5c14a5f944b91371961548b1907802f74a4d2e5c and below 1a4b802afe15c5b33b2dcb37a594aba2fa215d52 is affected.
- Version 5c14a5f944b91371961548b1907802f74a4d2e5c and below 4d0bf21e3e20619d51d06c0c36207aabab8b712c is affected.
- Version 5.12 is affected.
- Before 5.12 is unaffected.
- Version 6.12.91, <= 6.12.* is unaffected.
- Version 6.18.33, <= 6.18.* is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.