What happened
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Force requesting ACS when tboot is enabled Currently the conditions of requesting ACS in detect_intel_iommu() don't include tboot, leading to a possible misconfiguration with ACS disabled (e.g. due to user opts) while iommu is later forced on by tboot_force_iommu(). Fix it by checking tboot in detect_intel_iommu().
Affected versions
Linux: 5d990b627537e59a3a2f039ff588a4750e9c1a6a through before aaeb81241e802c86be69394f72d49fde3f861fbb (git); 5d990b627537e59a3a2f039ff588a4750e9c1a6a through before 45705a6bfdb283f7b3b509010fd617b72f942537 (git); 5d990b627537e59a3a2f039ff588a4750e9c1a6a through before 87bc611c6c98a41c00feb7b06b0c297dd141a2ae (git); 5d990b627537e59a3a2f039ff588a4750e9c1a6a through before 607432b2618b61df81134be0ef2562b8300c1216 (git); 2.6.33 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.