Vulnerability Description
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | >= 3.2, < 4.12 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-07
- https://www.debian.org/security/2021/dsa-5017Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-385.txtMitigationPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-07
- https://www.debian.org/security/2021/dsa-5017Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-385.txtMitigationPatchThird Party Advisory
FAQ
What is CVE-2021-28706?
CVE-2021-28706 is a vulnerability with a CVSS score of 8.6 (HIGH). guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrato...
How severe is CVE-2021-28706?
CVE-2021-28706 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28706?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Fedoraproject Fedora, Debian Debian Linux.