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().
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 5
https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0
416baaa9-dc9f-4396-8d5f-8c081fb06d67