CVE-2026-98159: wifi: mt76: mt7921: validate CLC firmware records
In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7921: validate CLC firmware records
The CLC region is supplied by firmware, but the loader trusts the region count and each record length. A malformed image can make the region table pointer precede the firmware buffer, make the record loop fail to advance, or index phy->clc past its end. Validate the table and record bounds before dereferencing or copying.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
In the Linux kernel wifi: mt76 mt7921 CLC firmware record loader, validate the CLC region table pointer, region count, and each record length against the firmware buffer bounds before dereferencing or copying records.
Event History
Frequently Asked Questions
What must an attacker control to trigger this issue?
The attacker would need to provide or cause the mt7921 driver to load a malformed CLC firmware image. The vulnerable parsing occurs because the driver trusts firmware-supplied region counts and record lengths.
Which systems are exposed?
Systems using the Linux kernel mt76 mt7921 Wi-Fi driver are relevant, provided they load CLC firmware records. The supplied data does not identify affected kernel versions or specific device models.
What can happen when malformed records are processed?
Malformed CLC data can cause the region table pointer to fall before the firmware buffer, prevent the record-processing loop from advancing, or cause indexing beyond the end of phy->clc. The resolved change adds table and record bounds validation before data is dereferenced or copied.