Stack-based buffer overflow in Linux kernel - CVE-2026-64270

Vulnerability details

The vulnerability allows a local attacker to overwrite stack memory and cause a denial of service.

The vulnerability exists due to a stack-based buffer overflow in mms114_interrupt() when processing a device-reported packet size from the touchscreen controller over the I2C bus. A local attacker can tamper with the I2C bus or use a malicious controller to supply an oversized packet size to overwrite stack memory and cause a denial of service.

The out-of-bounds write occurs on the IRQ-thread stack and may overwrite the stack canary, saved registers, and the return address.

Affected software

How to mitigate CVE-2026-64270

External References

• https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6
• https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023
• https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d
• https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8
• https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e

Related Security Bulletins

• Stack-based buffer overflow in Linux kernel input touchscreen driver