CVE-2026-90353 wifi: mt76: mt7915: fix ext PHY use-after-free on register error path
A use-after-free vulnerability in the Linux kernel mt7915 Wi-Fi driver allows attackers to cause denial of service or execute arbitrary code via error path handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90353?
CVE-2026-90353 is a high-severity use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7915: fix ext PHY use-after-free on register error path
After mt7915_register_ext_phy() succeeded, a failure of the main PHY mt7915_init_debugfs() or mt7915_coredump_register() unwound through free_phy2, which called ieee80211_free_hw() on the ext PHY hw while it was still registered with mac80211, since mt76_unregister_device() only unregisters the main hw. Unregister the ext PHY (thermal + phy + hw) first and skip the redundant free.
Which versions are affected by CVE-2026-90353?
How do I fix CVE-2026-90353?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-90353 being exploited?
There is no known exploitation of CVE-2026-90353 in the wild and no public exploit code.
Sources
Also known as AZL-101981, BELL-CVE-2026-90353, DEBIAN-CVE-2026-90353, GHSA-r94p-vpq4-r3gx, UBUNTU-CVE-2026-90353.