High severity7.8NVD Advisory· Published Sep 8, 2021· Updated Jun 17, 2026
CVE-2021-28701
CVE-2021-28701
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
34- osv-coords32 versionspkg:rpm/opensuse/xen&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/xen&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/xen&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/xen&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Micro%205.0pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Micro%205.1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 4.13.3_04-lp152.2.30.1+ 31 more
- (no CPE)range: < 4.13.3_04-lp152.2.30.1
- (no CPE)range: < 4.14.2_06-3.12.1
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.13.3_04-3.37.1
- (no CPE)range: < 4.14.2_06-3.12.1
- (no CPE)range: < 4.13.3_04-3.37.1
- (no CPE)range: < 4.14.2_06-3.12.1
- (no CPE)range: < 4.13.3_04-3.37.1
- (no CPE)range: < 4.14.2_06-3.12.1
- (no CPE)range: < 4.4.4_50-61.67.1
- (no CPE)range: < 4.7.6_16-43.79.5
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.12.4_14-3.52.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.12.4_14-3.52.1
- (no CPE)range: < 4.10.4_30-3.68.1
- (no CPE)range: < 4.12.4_16-3.57.1
- (no CPE)range: < 4.12.4_14-3.52.1
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.11.4_24-2.65.1
- (no CPE)range: < 4.9.4_22-3.94.2
- (no CPE)range: < 4.11.4_24-2.65.1
Patches
Vulnerability mechanics
References
8- www.openwall.com/lists/oss-security/2021/09/08/2nvdMailing ListThird Party Advisory
- xenbits.xen.org/xsa/advisory-384.htmlnvdVendor Advisory
- security.gentoo.org/glsa/202208-23nvdThird Party Advisory
- www.debian.org/security/2021/dsa-4977nvdThird Party Advisory
- xenbits.xenproject.org/xsa/advisory-384.txtnvdVendor Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/nvd
News mentions
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