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CVE-2021-28702

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202208-23
Posted Aug 15, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202208-23 - Multiple vulnerabilities have been discovered in Xen, the worst of which could result in remote code execution (guest sandbox escape). Versions less than 4.15.3 are affected.

tags | advisory, remote, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2021-28694, CVE-2021-28695, CVE-2021-28696, CVE-2021-28697, CVE-2021-28698, CVE-2021-28699, CVE-2021-28700, CVE-2021-28701, CVE-2021-28702, CVE-2021-28710, CVE-2022-21123, CVE-2022-21125, CVE-2022-21166, CVE-2022-23033
SHA-256 | 4b31aee7a5cd625cd40109d4e1ecb336918cb0c69db275257ec143711c990e8e
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