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CVE-2021-28698

Status Candidate

Overview

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.

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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