SB20260815169 - Improper input validation in Linux kernel vdpa octeon_ep driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-74309)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in the octep_vdpa_intr_handler interrupt handler when handling device interrupts with non-contiguous IRQ numbers. A local user can trigger the vulnerable interrupt handling path to cause a denial of service.

The issue occurs because the handler assumes irq - irqs[0] yields the correct ring index, which can fail when the first IRQ is not the base of a contiguous range.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0d21a1d6375a05274291e32c1ab7cd57dbb69513
• https://git.kernel.org/stable/c/3ef0cfa77a3d526591be069850d186c255e3f0cc
• https://git.kernel.org/stable/c/c6c7eae5de798442987619434171ac886035d57c