CVE-2026-80680 i2c: amd-mp2: Unregister callback on adapter add failure
A use-after-free vulnerability in the AMD MP2 I2C driver allows attackers to cause a system crash or potentially execute code via stale pointers.
- 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-2026-80680?
CVE-2026-80680 is a high-severity use after free vulnerability in Linux, published on 28 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:
i2c: amd-mp2: Unregister callback on adapter add failure
amd_mp2_register_cb() stores the platform I2C context in the MP2 PCI driver's callback table before the adapter is registered. If i2c_add_adapter() fails, probe returns and devres frees the context, but the PCI driver can still dereference the stale pointer from its IRQ and system-sleep callbacks.
Unregister the callback before returning the adapter registration error.
Which versions are affected by CVE-2026-80680?
How do I fix CVE-2026-80680?
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-2026-80680 being exploited?
There is no known exploitation of CVE-2026-80680 in the wild and no public exploit code.
Sources
Also known as AZL-98165, BELL-CVE-2026-80680, DEBIAN-CVE-2026-80680, GHSA-fwgv-mc92-549x, UBUNTU-CVE-2026-80680.