SB20260918425 - Race condition in Linux kernel iommu driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90244)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt the msi_page_list.

The vulnerability exists due to a race condition in iommu_dma_get_msi_page() when guest drivers concurrently allocate MSIs for devices assigned through a VFIO type1 legacy container. A local user can trigger concurrent MSI allocations to corrupt the msi_page_list.

Exploitation requires a VFIO type1 legacy container that merges two devices from different IOMMU groups onto a shared domain.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2af1e99ec14d226d66ceb9f16c663ee2568e6676
• https://git.kernel.org/stable/c/5a9e89ea34e0e34ac5d7e949042d665533549e40
• https://git.kernel.org/stable/c/e3c53e9173a47d5ce1fae020f2c6b1fb3c1123c2