CVE-2022-50562 tpm: acpi: Call acpi_put_table() to fix memory leak
A memory leak in the Linux kernel TPM ACPI driver allows local attackers to cause denial of service by exhausting system memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50562?
CVE-2022-50562 is a memory corruption vulnerability in Linux, published on 22 Oct 2025. 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:
tpm: acpi: Call acpi_put_table() to fix memory leak
The start and length of the event log area are obtained from TPM2 or TCPA table, so we call acpi_get_table() to get the ACPI information, but the acpi_get_table() should be coupled with acpi_put_table() to release the ACPI memory, add the acpi_put_table() properly to fix the memory leak.
While we are at it, remove the redundant empty line at the end of the tpm_read_log_acpi().
Which versions are affected by CVE-2022-50562?
How do I fix CVE-2022-50562?
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-2022-50562 being exploited?
There is no known exploitation of CVE-2022-50562 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50562, GHSA-j3g5-wx45-hj5x, UBUNTU-CVE-2022-50562.