SB2026081507 - Race condition in Linux kernel iommu intel driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74439)

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 synchronization in device_pasid_table_teardown() when tearing down scalable-mode context entries. A local user can trigger teardown of a PASID table entry to cause a denial of service.

The issue arises because hardware may fetch a torn entry while the Present bit remains set, which can result in spurious faults or stale walks to freed memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/588718101e8449605f1c7e858fecb7cfa701cdab
• https://git.kernel.org/stable/c/7fd4077dc92b91b1b844333c0a06bb9e286db10a
• https://git.kernel.org/stable/c/e9e83bcfe37dc719182500dd823c03ab57d934f0
• https://git.kernel.org/stable/c/f46452c3df7a8d8a5addc0926e76ef19ea7da0a0