CVE-2025-68792 tpm2-sessions: Fix out of range indexing in name_size
An out-of-bounds indexing flaw in the Linux kernel TPM2 sessions allows attackers to cause memory corruption, potentially leading to code execution or system crashes.
- 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-2025-68792?
CVE-2025-68792 is a high-severity memory corruption vulnerability in Linux, published on 13 Jan 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:
tpm2-sessions: Fix out of range indexing in name_size
'name_size' does not have any range checks, and it just directly indexes with TPM_ALG_ID, which could lead into memory corruption at worst.
Address the issue by only processing known values and returning -EINVAL for unrecognized values.
Make also 'tpm_buf_append_name' and 'tpm_buf_fill_hmac_session' fallible so that errors are detected before causing any spurious TPM traffic.
End also the authorization session on failure in both of the functions, as the session state would be then by definition corrupted.
Which versions are affected by CVE-2025-68792?
How do I fix CVE-2025-68792?
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-2025-68792 being exploited?
There is no known exploitation of CVE-2025-68792 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68792, DEBIAN-CVE-2025-68792, GHSA-2wfq-pvgx-w5wx, UBUNTU-CVE-2025-68792.