CVE-2026-31627 i2c: s3c24xx: check the size of the SMBUS message before using it
A missing size check in the Linux kernel's s3c24xx I2C driver allows attackers to cause memory corruption or denial of service via crafted SMBUS messages.
- 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-2026-31627?
CVE-2026-31627 is a high-severity vulnerability in Linux kernel, published on 24 Apr 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:
i2c: s3c24xx: check the size of the SMBUS message before using it
The first byte of an i2c SMBUS message is the size, and it should be verified to ensure that it is in the range of 0..I2C_SMBUS_BLOCK_MAX before processing it.
This is the same logic that was added in commit a6e04f05ce0b ("i2c: tegra: check msg length in SMBUS block read") to the i2c tegra driver.
Which versions are affected by CVE-2026-31627?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31627?
Apply the vendor's patch.
Is CVE-2026-31627 being exploited?
There is no known exploitation of CVE-2026-31627 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83762, BELL-CVE-2026-31627, DEBIAN-CVE-2026-31627, GHSA-q8hh-7xg8-pfvm, ROOT-OS-DEBIAN-11-CVE-2026-31627, ROOT-OS-DEBIAN-12-CVE-2026-31627 and 3 more.