VDB
CVE-2021-28702
CVE-2021-28702
PUBLISHED
PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.
EPSS 0.05% · 17.1th percentile
Risk Scores
EPSS Score
0.05%
17.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:24.04:LTS | xen | 4.17.3+10-g091466ba55-1, 4.17.3+10-g091466ba55-1.1ubuntu2, * |
| Ubuntu:18.04:LTS | xen | 4.9.0-0ubuntu3, 0, 4.9.2-0ubuntu1 |
| Ubuntu:16.04:LTS | xen | 4.6.0-1ubuntu4, 0, 4.5.1-0ubuntu1 |
| Ubuntu:25.10 | xen | 4.20.0+68-g35cb38b222-1, 0, 4.20.0-1ubuntu1 |
| Ubuntu:20.04:LTS | xen | 4.9.2-0ubuntu2, 4.11.3+24-g14b62ab3e5-1ubuntu1, 4.11.3+24-g14b62ab3e5-1ubuntu2 |
| Ubuntu:22.04:LTS | xen | 0, *, 4.16.0-1~ubuntu2 |
Exploit Intelligence
- https://xenbits.xenproject.org/xsa/advisory-386.txt (circl)
- [oss-security] 20211007 Xen Security Advisory 386 v2 (CVE-2021-28702) - PCI devices with RMRRs not deassigned correctly (circl)
- FEDORA-2021-80bbe7def0 (circl)
- FEDORA-2021-0b7a484688 (circl)
- FEDORA-2021-829f5f2f43 (circl)
- DSA-5017 (circl)
- GLSA-202208-23 (circl)
Timeline
- Oct 6, 2021 CVE Published
- Oct 7, 2021 EPSS Score
- Dec 3, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Jan 28, 2022 EPSS Score
- Mar 26, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 22, 2022 EPSS Score
- Jul 19, 2022 EPSS Score
- Sep 13, 2022 EPSS Score
- Nov 9, 2022 EPSS Score
- Jan 5, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-28702 third-party-advisory
- https://xenbits.xen.org/xsa/advisory-386.html third-party-advisory
- https://xenbits.xenproject.org/xsa/advisory-386.txt third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-28702 third-party-advisory