CVE-2021-46922 KEYS: trusted: Fix TPM reservation for seal/unseal
A missing TPM operation check in the Linux kernel causes an imbalance leading to system crashes on TIS-based hardware.
- 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-2021-46922?
CVE-2021-46922 is a high-severity vulnerability in Linux kernel, published on 27 Feb 2024. 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:
KEYS: trusted: Fix TPM reservation for seal/unseal
The original patch 8c657a0590de ("KEYS: trusted: Reserve TPM for seal and unseal operations") was correct on the mailing list:
https://lore.kernel.org/linux-integrity/[email protected]/
But somehow got rebased so that the tpm_try_get_ops() in tpm2_seal_trusted() got lost. This causes an imbalanced put of the TPM ops and causes oopses on TIS based hardware.
This fix puts back the lost tpm_try_get_ops()
Which versions are affected by CVE-2021-46922?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-46922?
Apply the vendor's patch.
Is CVE-2021-46922 being exploited?
There is no known exploitation of CVE-2021-46922 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-46922, GHSA-g9mf-qvgg-vwxr, UBUNTU-CVE-2021-46922.