Improper Initialization Affecting kernel-debuginfo package, versions <0:4.14.231-173.360.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNELDEBUGINFO-1698039
- published 27 Sep 2021
- disclosed 6 Apr 2021
Introduced: 6 Apr 2021
CVE-2021-28688 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel-debuginfo to version 0:4.14.231-173.360.amzn2 or higher.
This issue was patched in ALAS2-2021-1627.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.