CVE-2021-28701

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.

Link	Resource
https://xenbits.xenproject.org/xsa/advisory-384.txt	Vendor Advisory
http://xenbits.xen.org/xsa/advisory-384.html	Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/09/08/2	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/	Mailing List Third Party Advisory
https://www.debian.org/security/2021/dsa-4977	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202208-23	Third Party Advisory

Configuration 1

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

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Published : 2021-09-08 02:15

Updated : 2022-10-28 04:20

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NVD link : CVE-2021-28701

Mitre link : CVE-2021-28701

No products.

CWE-362