Is CVE-2021-28688 in the CISA KEV catalog?

No. CVE-2021-28688 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28688?

CVE-2021-28688 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-28688?

CVE-2021-28688 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28688?

Upgrade linux on debian 11 to 5.10.28-1 or later. Fixes are available for 102 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28688

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-665

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.28-1CVE-2021-28688

linuxUbuntu

Fixed in:4.4.0-222.255USN-5343-1

Fixed in:4.15.0-143.147USN-4946-1

Fixed in:5.4.0-74.83USN-4982-1

linux-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

Fixed in:4.4.0-1138.152USN-5343-1

Fixed in:4.15.0-1102.109USN-4946-1

Fixed in:5.4.0-1049.51USN-4982-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1049.51~18.04.1USN-4982-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1102.109~16.04.1USN-4946-1

linux-azureUbuntu

Fixed in:4.15.0-1114.127~14.04.1USN-4946-1

Fixed in:5.4.0-1048.50USN-4982-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1114.127USN-4946-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1048.50~18.04.1USN-4982-1

linux-dell300xUbuntu

Fixed in:4.15.0-1018.22USN-4946-1

linux-gcpUbuntu

Fixed in:4.15.0-1099.112~16.04.1USN-4946-1

Fixed in:5.4.0-1044.47USN-4982-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1099.112USN-4946-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1044.47~18.04.2USN-4982-1

linux-gkeUbuntu

Fixed in:5.4.0-1044.46USN-4982-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4982-1

linux-gkeopUbuntu

Fixed in:5.4.0-1016.17USN-4982-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1016.17~18.04.1USN-4982-1

linux-hweUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-74.83~18.04.1USN-4982-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-55.62~20.04.1USN-4984-1

linux-image-4.15.0-1018-dell300xUbuntu

Fixed in:4.15.0-1018.22USN-4946-1

linux-image-4.15.0-1071-oracleUbuntu

Fixed in:4.15.0-1071.79~16.04.1USN-4946-1

Fixed in:4.15.0-1071.79USN-4946-1

linux-image-4.15.0-1085-raspi2Ubuntu

Fixed in:4.15.0-1085.90USN-4946-1

linux-image-4.15.0-1091-kvmUbuntu

Fixed in:4.15.0-1091.93USN-4946-1

linux-image-4.15.0-1099-gcpUbuntu

Fixed in:4.15.0-1099.112~16.04.1USN-4946-1

Fixed in:4.15.0-1099.112USN-4946-1

linux-image-4.15.0-1102-awsUbuntu

Fixed in:4.15.0-1102.109~16.04.1USN-4946-1

Fixed in:4.15.0-1102.109USN-4946-1

linux-image-4.15.0-1102-snapdragonUbuntu

Fixed in:4.15.0-1102.111USN-4946-1

linux-image-4.15.0-1114-azureUbuntu

Fixed in:4.15.0-1114.127~14.04.1USN-4946-1

Fixed in:4.15.0-1114.127USN-4946-1

linux-image-4.15.0-143-genericUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.15.0-143-generic-lpaeUbuntu

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.15.0-143-lowlatencyUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.4.0-1102-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

linux-image-4.4.0-1103-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

linux-image-4.4.0-1138-awsUbuntu

Fixed in:4.4.0-1138.152USN-5343-1

linux-image-4.4.0-222-genericUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-4.4.0-222-lowlatencyUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-5.10.0-1026-oemUbuntu

Fixed in:5.10.0-1026.27USN-4948-1

linux-image-5.4.0-1016-gkeopUbuntu

Fixed in:5.4.0-1016.17~18.04.1USN-4982-1

Fixed in:5.4.0-1016.17USN-4982-1

linux-image-5.4.0-1036-raspiUbuntu

Fixed in:5.4.0-1036.39~18.04.1USN-4982-1

Fixed in:5.4.0-1036.39USN-4982-1

linux-image-5.4.0-1040-kvmUbuntu

Fixed in:5.4.0-1040.41USN-4982-1

linux-image-5.4.0-1044-gcpUbuntu

Fixed in:5.4.0-1044.47~18.04.2USN-4982-1

Fixed in:5.4.0-1044.47USN-4982-1

linux-image-5.4.0-1044-gkeUbuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4982-1

Fixed in:5.4.0-1044.46USN-4982-1

linux-image-5.4.0-1046-oracleUbuntu

Fixed in:5.4.0-1046.50~18.04.2USN-4982-1

Fixed in:5.4.0-1046.50USN-4982-1

linux-image-5.4.0-1048-azureUbuntu

Fixed in:5.4.0-1048.50~18.04.1USN-4982-1

Fixed in:5.4.0-1048.50USN-4982-1

linux-image-5.4.0-1049-awsUbuntu

Fixed in:5.4.0-1049.51~18.04.1USN-4982-1

Fixed in:5.4.0-1049.51USN-4982-1

linux-image-5.4.0-74-genericUbuntu

Fixed in:5.4.0-74.83~18.04.1USN-4982-1

Fixed in:5.4.0-74.83USN-4982-1

linux-image-5.4.0-74-generic-lpaeUbuntu

Fixed in:5.4.0-74.83~18.04.1USN-4982-1

Fixed in:5.4.0-74.83USN-4982-1

linux-image-5.4.0-74-lowlatencyUbuntu

Fixed in:5.4.0-74.83~18.04.1USN-4982-1

Fixed in:5.4.0-74.83USN-4982-1

linux-image-5.8.0-55-genericUbuntu

Fixed in:5.8.0-55.62~20.04.1USN-4984-1

linux-image-5.8.0-55-generic-64kUbuntu

Fixed in:5.8.0-55.62~20.04.1USN-4984-1

linux-image-5.8.0-55-generic-lpaeUbuntu

Fixed in:5.8.0-55.62~20.04.1USN-4984-1

linux-image-5.8.0-55-lowlatencyUbuntu

Fixed in:5.8.0-55.62~20.04.1USN-4984-1

linux-image-awsUbuntu

Fixed in:4.4.0.1102.100USN-5343-1

Fixed in:4.4.0.1138.143USN-5343-1

Fixed in:5.4.0.1049.31USN-4982-1

Fixed in:5.4.0.1049.50USN-4982-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1102.93USN-4946-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1102.105USN-4946-1

linux-image-azureUbuntu

Fixed in:4.15.0.1114.87USN-4946-1

Fixed in:5.4.0.1048.27USN-4982-1

Fixed in:5.4.0.1048.46USN-4982-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1114.87USN-4946-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1018.20USN-4946-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1099.100USN-4946-1

Fixed in:5.4.0.1044.31USN-4982-1

Fixed in:5.4.0.1044.53USN-4982-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1099.117USN-4946-1

linux-image-genericUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.8.0.55.62~20.04.39USN-4984-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.55.62~20.04.39USN-4984-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.8.0.55.62~20.04.39USN-4984-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1099.100USN-4946-1

Fixed in:5.4.0.1044.53USN-4982-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1044.46~18.04.10USN-4982-1

Fixed in:5.4.0.1044.53USN-4982-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1016.19USN-4982-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1016.17~18.04.17USN-4982-1

Fixed in:5.4.0.1016.19USN-4982-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1103.101USN-5343-1

Fixed in:4.15.0.1091.87USN-4946-1

Fixed in:5.4.0.1040.38USN-4982-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.55.62~20.04.39USN-4984-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-oemUbuntu

Fixed in:4.15.0.143.139USN-4946-1

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1026.27USN-4948-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1071.59USN-4946-1

Fixed in:5.4.0.1046.50~18.04.28USN-4982-1

Fixed in:5.4.0.1046.45USN-4982-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1071.81USN-4946-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1036.71USN-4982-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1036.38USN-4982-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1085.82USN-4946-1

Fixed in:5.4.0.1036.71USN-4982-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1102.105USN-4946-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

linux-image-virtualUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.74.83~18.04.67USN-4982-1

Fixed in:5.4.0.74.77USN-4982-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.55.62~20.04.39USN-4984-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

Fixed in:4.15.0-1091.93USN-4946-1

Fixed in:5.4.0-1040.41USN-4982-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1026.27USN-4948-1

linux-oracleUbuntu

Fixed in:4.15.0-1071.79~16.04.1USN-4946-1

Fixed in:4.15.0-1071.79USN-4946-1

Fixed in:5.4.0-1046.50USN-4982-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1046.50~18.04.2USN-4982-1

linux-raspiUbuntu

Fixed in:5.4.0-1036.39USN-4982-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1036.39~18.04.1USN-4982-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1085.90USN-4946-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1102.111USN-4946-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Patch1

xenbits.xenproject.org

Third-Party Advisory2

Related Vulnerabilities

Other CWE-665 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-0847	High	7.8	88%	KEV	Fix
CVE-2022-22719	High	7.5	70%	-	Fix
CVE-2020-28019	High	7.5	61%	-	Fix
CVE-2022-46164	Critical	9.4	49%	-	Fix
CVE-2022-37128	Critical	9.8	21%	-	-
CVE-2019-14271	Critical	9.8	19%	-	Fix

Embed a live status badge for CVE-2021-28688

Markdown

[![CVE-2021-28688](https://tridentstack.com/cve/badge/CVE-2021-28688.svg)](https://tridentstack.com/cve/CVE-2021-28688)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-28688"><img src="https://tridentstack.com/cve/badge/CVE-2021-28688.svg" alt="CVE-2021-28688"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.