In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: Place upper limit on station AID Any station configured with… (CVE-2026-53317)
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.
AI Analysis
Technical Summary
The Linux kernel mt76 driver for mt7921 hardware had a vulnerability where station AIDs above 20 caused firmware crashes on AP interfaces. This was observed with a modified hostapd that allocated AIDs starting at 65, unlike the stock hostapd which starts at 1 and enforces an upper limit on associated stations. The fix prevents firmware crashes by enforcing an upper limit on AIDs but does not enable operation with AIDs above 20. The issue does not affect station mode interfaces.
Potential Impact
The vulnerability leads to a denial of service condition via firmware crash on affected AP interfaces when a station is assigned an AID over 20. There is no impact on confidentiality or integrity. The crash is triggered by out-of-range AID values from modified hostapd configurations. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel mt76 driver to enforce an upper limit on station AIDs, preventing firmware crashes. Users should ensure they are running a Linux kernel version that includes this fix. Since no patch links or vendor advisories are provided, verify the kernel version and update accordingly. Avoid using modified hostapd versions that assign AIDs above 20 on AP interfaces.
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: Place upper limit on station AID Any station configured with… (CVE-2026-53317)
Description
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.
CVSS v3.1
Score 5.5medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel mt76 driver for mt7921 hardware had a vulnerability where station AIDs above 20 caused firmware crashes on AP interfaces. This was observed with a modified hostapd that allocated AIDs starting at 65, unlike the stock hostapd which starts at 1 and enforces an upper limit on associated stations. The fix prevents firmware crashes by enforcing an upper limit on AIDs but does not enable operation with AIDs above 20. The issue does not affect station mode interfaces.
Potential Impact
The vulnerability leads to a denial of service condition via firmware crash on affected AP interfaces when a station is assigned an AID over 20. There is no impact on confidentiality or integrity. The crash is triggered by out-of-range AID values from modified hostapd configurations. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel mt76 driver to enforce an upper limit on station AIDs, preventing firmware crashes. Users should ensure they are running a Linux kernel version that includes this fix. Since no patch links or vendor advisories are provided, verify the kernel version and update accordingly. Avoid using modified hostapd versions that assign AIDs above 20 on AP interfaces.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-86cw-5chj-gj42
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-53317"]
- Ecosystems
- []
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a4c33fd27e9c797195f2804
Added to database: 07/06/2026, 23:02:21 UTC
Last enriched: 07/06/2026, 23:09:18 UTC
Last updated: 07/31/2026, 19:24:46 UTC
Views: 5
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