High severity7.8NVD Advisory· Published Feb 18, 2021· Updated Jun 17, 2026
CVE-2021-27379
CVE-2021-27379
Description
An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
19- Xen/Xendescription
- osv-coords15 versionspkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/xen&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%208
< 4.10.4_24-3.56.1+ 14 more
- (no CPE)range: < 4.10.4_24-3.56.1
- (no CPE)range: < 4.11.4_16-2.51.1
- (no CPE)range: < 4.10.4_24-3.56.1
- (no CPE)range: < 4.11.4_16-2.51.1
- (no CPE)range: < 4.9.4_16-3.83.1
- (no CPE)range: < 4.9.4_16-3.83.1
- (no CPE)range: < 4.9.4_16-3.83.1
- (no CPE)range: < 4.9.4_16-3.83.1
- (no CPE)range: < 4.9.4_16-3.83.1
- (no CPE)range: < 4.10.4_24-3.56.1
- (no CPE)range: < 4.7.6_14-43.76.1
- (no CPE)range: < 4.7.6_14-43.76.1
- (no CPE)range: < 4.11.4_16-2.51.1
- (no CPE)range: < 4.11.4_16-2.51.1
- (no CPE)range: < 4.9.4_16-3.83.1
Patches
Vulnerability mechanics
References
4- xenbits.xen.org/xsa/advisory-366.htmlnvdMitigationPatchVendor Advisory
- xenbits.xen.org/xsa/advisory-366.htmlnvdPatchVendor Advisory
- www.openwall.com/lists/oss-security/2021/02/23/1nvdMailing ListThird Party Advisory
- www.debian.org/security/2021/dsa-4888nvdThird Party Advisory
News mentions
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