CVE-2026-74324 wifi: mt76: mt7925: validate skb length in testmode query
A local attacker with testmode access can read kernel memory via an out-of-bounds read in the mt7925 WiFi driver.
- 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-2026-74324?
CVE-2026-74324 is a vulnerability in Linux, published on 15 Aug 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: mt7925: validate skb length in testmode query
In mt7925_tm_query(), the response skb from mt76_mcu_send_and_get_msg() is used in a memcpy without validating its length:
memcpy(evt_resp, skb->data + 8, MT7925_EVT_RSP_LEN);
where MT7925_EVT_RSP_LEN is 512. If the firmware returns a response shorter than 520 bytes (8 + 512), this reads beyond the skb data buffer. The over-read data is then returned to userspace via nla_put() in mt7925_testmode_dump().
Add a length check before the memcpy to ensure the skb contains sufficient data.
Which versions are affected by CVE-2026-74324?
How do I fix CVE-2026-74324?
Apply the vendor's patch.
Is CVE-2026-74324 being exploited?
There is no known exploitation of CVE-2026-74324 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74324, DEBIAN-CVE-2026-74324, GHSA-22xx-mmhm-wq6h, UBUNTU-CVE-2026-74324.