Out-of-bounds read in Linux kernel - CVE-2026-74751

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the riscv ZBB-optimized strnlen implementation when processing memory ranges whose end falls on a page boundary. A remote attacker can trigger the vulnerable code path to cause a denial of service.

The issue occurs when the requested count ends exactly at an aligned boundary and the following page is unmapped.

Affected software

How to mitigate CVE-2026-74751

External References

• https://git.kernel.org/stable/c/5d588c684833e678a0008eb69c33190f01a65f4b
• https://git.kernel.org/stable/c/e697e30f3dd2da3a1df7dc0980546d5b53aea4b6

Related Security Bulletins

• Out-of-bounds read in Linux kernel riscv lib