CVE-2021-28039

An issue was discovered in the Linux kernel 5.9.x through 5.11.3, as used with Xen. In some less-common configurations, an x86 PV guest OS user can crash a Dom0 or driver domain via a large amount of I/O activity. The issue relates to misuse of guest physical addresses when a configuration has CONFIG_XEN_UNPOPULATED_ALLOC but not CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.

• CWE-131

• http://www.openwall.com/lists/oss-security/2021/03/05/2Mailing List, Patch, Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-369.htmlPatch, Vendor Advisory
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2
• https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/03/05/2Mailing List, Patch, Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-369.htmlPatch, Vendor Advisory
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2
• https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory

Published

Mar 5, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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