Is CVE-2021-3501 in the CISA KEV catalog?

No. CVE-2021-3501 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3501?

CVE-2021-3501 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-3501?

CVE-2021-3501 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3501?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3501

HIGH

7.1

CVSS v3

NVD

Description

A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-3501

linux-image-5.10.0-1029-oemUbuntu

Fixed in:5.10.0-1029.30USN-4983-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1029.30USN-4983-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1029.30USN-4983-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1029.30USN-4983-1

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

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Patch2

Third-Party Advisory1

security.netapp.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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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.