vulnerability

Gentoo Linux: CVE-2021-28701: Xen: Multiple Vulnerabilities

Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
2021-09-08
Added
2022-08-16
Modified
2025-01-28

Description

Another race in XENMAPSPACE_grant_table handling Guests are 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, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Solution(s)

gentoo-linux-upgrade-app-emulation-xengentoo-linux-upgrade-app-emulation-xen-tools
Title
NEW

Explore Exposure Command

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