CVE-2026-80571 powerpc/pseries: papr-phy-attest - validate cmd.length, plug mem leak
A buffer overflow in the Linux kernel's powerpc/pseries papr-phy-attest driver allows local attackers to execute code or escalate privileges due to missing length validation.
- 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-2026-80571?
CVE-2026-80571 is a memory corruption vulnerability in Linux, published on 26 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:
powerpc/pseries: papr-phy-attest - validate cmd.length, plug mem leak
In papr_phy_attest_create_handle(), the params->cmd.length is not validated before use, which can result in a buffer overlow. Check it and return -EINVAL if it is either 0 or exceeds sizeof(params->cmd).
Also, params is freed on the success path but not error. Free it on errors after memory allocation. And free it on negative fd.
Which versions are affected by CVE-2026-80571?
How do I fix CVE-2026-80571?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80571 being exploited?
There is no known exploitation of CVE-2026-80571 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80571, DEBIAN-CVE-2026-80571, UBUNTU-CVE-2026-80571.