CVE-2023-46835
published 2024-01-05CVE-2023-46835: The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of…
PriorityP426medium5.5CVSS 3.1
AVLACLPRLUINSUCHINAN
EPSS
0.28%
20.3th percentile
The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.
However dom_io being a PV domain gets the AMD-Vi IOMMU page tables
levels based on the maximum (hot pluggable) RAM address, and hence on
systems with no RAM above the 512GB mark only 3 page-table levels are
configured in the IOMMU.
On systems without RAM above the 512GB boundary
amd_iommu_quarantine_init() will setup page tables for the scratch
page with 4 levels, while the IOMMU will be configured to use 3 levels
only, resulting in the last page table directory (PDE) effectively
becoming a page table entry (PTE), and hence a device in quarantine
mode gaining write access to the page destined to be a PDE.
Due to this page table level mismatch, the sink page the device gets
read/write access to is no longer cleared between device assignment,
possibly leading to data leaks.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xen | < xen 4.17.2+76-ge1f9cb16e2-1~deb12u1 (bookworm) | xen 4.17.2+76-ge1f9cb16e2-1~deb12u1 (bookworm) |
| xen | xen | >= 0 < 4.15.5-r3 | 4.15.5-r3 |
| xen | xen | >= 0 < 4.16.5-r4 | 4.16.5-r4 |
| xen | xen | >= 0 < 4.16.5-r4 | 4.16.5-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1~deb12u1 | 4.17.2+76-ge1f9cb16e2-1~deb12u1 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1 | 4.17.2+76-ge1f9cb16e2-1 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1 | 4.17.2+76-ge1f9cb16e2-1 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
osv5.5MEDIUM
vendor_debian5.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-c2mm-wq7p-rpm8: The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMA
ghsa_unreviewed·2024-01-05
CVE-2023-46835 [MEDIUM] CWE-787 GHSA-c2mm-wq7p-rpm8: The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMA
The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.
However dom_io being a PV domain gets the AMD-Vi IOMMU page tables
levels based on the maximum (hot pluggable) RAM address, and hence on
systems with no RAM above the 512GB mark only 3 page-table levels are
configured in the IOMMU.
On systems without RAM above the 512GB boundary
amd_iommu_quarantine_init() will setup page tables for the scratch
page with 4 levels, while the IOMMU will be configured to use 3 levels
only, resulting in the last page table directory (PDE) effectively
becoming a page table entry (PTE), and hence a device in quarantine
mode gaining write access to the page dest
OSV
CVE-2023-46835: The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMA
osv·2024-01-05·CVSS 5.5
CVE-2023-46835 [MEDIUM] CVE-2023-46835: The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMA
The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels. However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU. On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destin
OSV
CVE-2023-46835: The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMA
osv·2024-01-05·CVSS 5.5
CVE-2023-46835 [MEDIUM] CVE-2023-46835: The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMA
The current setup of the quarantine page tables assumes that the
quarantine domain (dom_io) has been initialized with an address width
of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels.
However dom_io being a PV domain gets the AMD-Vi IOMMU page tables
levels based on the maximum (hot pluggable) RAM address, and hence on
systems with no RAM above the 512GB mark only 3 page-table levels are
configured in the IOMMU.
On systems without RAM above the 512GB boundary
amd_iommu_quarantine_init() will setup page tables for the scratch
page with 4 levels, while the IOMMU will be configured to use 3 levels
only, resulting in the last page table directory (PDE) effectively
becoming a page table entry (PTE), and hence a device in quarantine
mode gaining write access to the page dest
Debian
CVE-2023-46835: xen - The current setup of the quarantine page tables assumes that the quarantine doma...
vendor_debian·2023·CVSS 5.5
CVE-2023-46835 [MEDIUM] CVE-2023-46835: xen - The current setup of the quarantine page tables assumes that the quarantine doma...
The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels. However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU. On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destin
No detection rules found.
No public exploits indexed.
2024-01-05
Published