{"schemaVersion":3,"id":"CVE-2021-28701","aliases":["ALPINE-CVE-2021-28701","SUSE-SU-2021:3140-1","SUSE-SU-2021:3140-2","SUSE-SU-2021:3141-1","SUSE-SU-2021:3181-1","SUSE-SU-2021:3213-1","UBUNTU-CVE-2021-28701","DEBIAN-CVE-2021-28701","openSUSE-SU-2021:1301-1","openSUSE-SU-2021:3140-1"],"status":"published","duplicateOf":null,"title":null,"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. 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