CVE-2024-36477 tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer
A missing header size calculation in the Linux kernel TPM SPI driver causes out-of-bounds memory access, potentially leading to crashes or code execution.
- 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-2024-36477?
CVE-2024-36477 is a high-severity memory corruption vulnerability in Linux kernel, published on 21 Jun 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:
tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer
The TPM SPI transfer mechanism uses MAX_SPI_FRAMESIZE for computing the maximum transfer length and the size of the transfer buffer. As such, it does not account for the 4 bytes of header that prepends the SPI data frame. This can result in out-of-bounds accesses and was confirmed with KASAN.
Introduce SPI_HDRSIZE to account for the header and use to allocate the transfer buffer.
Weakness: CWE-125
Which versions are affected by CVE-2024-36477?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-36477?
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-2024-36477 being exploited?
There is no known exploitation of CVE-2024-36477 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-42829, AZL-42857, BELL-CVE-2024-36477, DEBIAN-CVE-2024-36477, GHSA-2366-559p-m86q, UBUNTU-CVE-2024-36477.