SB2026082474 - Race condition in Linux kernel vhost driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74702)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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 state management in vhost_scsi_set_features() and the vhost-scsi I/O path when changing negotiated virtio feature bits after the endpoint is active. A local user can change the VIRTIO_SCSI_F_T10_PI feature after endpoint setup and trigger crafted I/O processing to cause a denial of service.

The issue can lead to a kernel BUG_ON when handling a 129-page protection payload because command resources are not rebuilt to match the changed feature state.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/42bc45df5905e2b7dccb72adaf7730f66cfbe03f
• https://git.kernel.org/stable/c/9a3eb77a612f9d158e4d27df43677a014e9cfa55
• https://git.kernel.org/stable/c/a06e4611d45518896fbff4f45d9581578b107e91