SB20260918289 - Improper Validation of Specified Quantity in Input in Linux kernel mt76 mt7921 driver
Published: September 18, 2026
Security Bulletin ID
SB20260918289
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-90379)
CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input
CVSSv4: 4.1 [CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an attacker with physical access to cause a denial of service.
The vulnerability exists due to improper validation of a DMA queue index in the mt76 DMA queue handling code when processing DMA queue state after a PCIe AER error causes the bus to hang. An attacker with physical access can induce a hung PCIe bus state to cause a denial of service.
Remediation
Install update from vendor's website.