cbcvebase.
CVE-2021-28710
published 2021-11-21

CVE-2021-28710: certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable…

PriorityP341high8.8CVSS 3.1
AVLACLPRLUINSCCHIHAH
EPSS
0.28%
19.5th percentile
certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table's address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries.

Affected

14 ranges
VendorProductVersion rangeFixed in
debianxen——
fedoraprojectfedora——
xenxen——
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 0 < 4.15.1-r14.15.1-r1
xenxen>= 4.15.x < unspecifiedunspecified

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv2.06.9MEDIUMAV:L/AC:M/Au:N/C:C/I:C/A:C
osv8.8HIGH
vendor_debian8.8LOW
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