Vulnerability Details : CVE-2021-28688
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.
Exploit prediction scoring system (EPSS) score for CVE-2021-28688
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 10 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-28688
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST |
|
6.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
2.0
|
4.0
|
NIST |
CWE ids for CVE-2021-28688
-
The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-28688
-
https://xenbits.xenproject.org/xsa/advisory-371.txt
Patch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
[SECURITY] [DLA 2690-1] linux-4.19 security updateThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
[SECURITY] [DLA 2689-1] linux security updateThird Party Advisory
Products affected by CVE-2021-28688
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*