SB2026082475 - Improper input validation in Linux kernel vhost driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-74703)

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 vhost-scsi request handling logic when processing a malformed request with negotiated T10 PI protection bytes. A local user can send a specially crafted request to cause a denial of service.

The issue is triggered when protection bytes cover or exceed the expected payload length, allowing a zero data scatterlist count to reach a BUG_ON condition.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2417a498cf3fe64d06faf87e236eda98dd4f04e0
• https://git.kernel.org/stable/c/d876c493fc4b811941bfeb4c80beb2dfc4bf025e
• https://git.kernel.org/stable/c/f8fe3f8d342da750dd10361bf66009fd3072926b