Improper Initialization Affecting linux-4.19 package, versions <4.19.194-1~deb9u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.04% (16th percentile)

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  • Snyk IDSNYK-DEBIAN9-LINUX419-1312525
  • published31 Mar 2021
  • disclosed6 Apr 2021

Introduced: 31 Mar 2021

CVE-2021-28688  (opens in a new tab)
CWE-665  (opens in a new tab)

How to fix?

Upgrade Debian:9 linux-4.19 to version 4.19.194-1~deb9u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.19 package and not the linux-4.19 package as distributed by Debian. See How to fix? for Debian:9 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.

CVSS Base Scores

version 3.1