CVE-2021-28039

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-05 · updated 2026-06-17
Weakness: CWE-131

Description

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.

Affected products

Linux kernel: from 5.9.0 through 5.11.3
NetApp Cloud Backup: all versions
NetApp Solidfire Baseboard Management Controller Firmware: all versions
xen: all versions

References

http://www.openwall.com/lists/oss-security/2021/03/05/2
http://xenbits.xen.org/xsa/advisory-369.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2
https://security.netapp.com/advisory/ntap-20210409-0001/
http://www.openwall.com/lists/oss-security/2021/03/05/2
http://xenbits.xen.org/xsa/advisory-369.html
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2
https://security.netapp.com/advisory/ntap-20210409-0001/

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