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CVE-2021-28697

Status Candidate

Overview

grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.

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
Download | Favorite | View
Debian Security Advisory 4977-1
Posted Sep 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4977-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, vulnerability
systems | linux, debian
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
SHA-256 | d81161044e1a99166a8514342c122a44470dc3e7951d7c4383ff8fd3711141c2
Download | Favorite | View
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