Vulnerability Description
The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.11, <= 5.10.18 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlThird Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-371.txtPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlThird Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-371.txtPatchThird Party Advisory
FAQ
What is CVE-2021-28688?
CVE-2021-28688 is a vulnerability with a CVSS score of 6.5 (MEDIUM). The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions ...
How severe is CVE-2021-28688?
CVE-2021-28688 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28688?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.