SB20260815143 - Use-after-free in Linux kernel mediatek mt76 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-74325)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in the mt76 offchannel link handling in mt76_put_vif_phy_link when processing concurrent TX datapath activity under RCU. A local user can trigger concurrent access to a freed offchannel link object to cause a denial of service.

The issue occurs because an existing RCU reader may continue dereferencing the pointer after it has been freed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/50e700ac0edce72dee5c3a9755865d9423696ac7
• https://git.kernel.org/stable/c/7fae097aa9a56c30febf539d72ef3773165d3aa3
• https://git.kernel.org/stable/c/c7a83899203ed36696a2d35ddd03c0f522874a63