Stack-based buffer overflow in Linux kernel - CVE-2026-97503

Vulnerability details

The vulnerability allows a local user to trigger a stack-based buffer overflow.

The vulnerability exists due to insufficient buffer size calculation in the /proc/irq directory name handling in kernel/irq/proc.c when formatting ten-digit interrupt numbers. A local user can trigger registration or removal of an interrupt proc entry with a ten-digit interrupt number to trigger a stack-based buffer overflow.

Exploitation requires a sparse-IRQ configuration that permits ten-digit interrupt numbers.

Affected software

How to mitigate CVE-2026-97503

External References

• https://git.kernel.org/stable/c/c2c7983c93f5d86962318be7e7298f1bc3feb1a6
• https://git.kernel.org/stable/c/d4b22fbae70037299e96539c330e4a1054b28a91

Related Security Bulletins

• Stack-based buffer overflow in Linux kernel irq