Is CVE-2021-28951 in the CISA KEV catalog?

No. CVE-2021-28951 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28951?

CVE-2021-28951 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-28951?

CVE-2021-28951 has an EPSS score of 0.28% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28951?

Upgrade linux on debian 11 to 5.10.26-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28951

MEDIUM

5.5

CVSS v3

NVD

Description

An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.

CWE-667

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.26-1CVE-2021-28951

linux-image-5.10.0-1026-oemUbuntu

Fixed in:5.10.0-1026.27USN-4948-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1026.27USN-4948-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1026.27USN-4948-1

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

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.28%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Patch1

git.kernel.org

Third-Party Advisory1

security.netapp.com

Other references3

Related Vulnerabilities

Other CWE-667 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-10072	High	7.5	73%	-	Fix
CVE-2002-1850	High	7.5	17%	-	Fix
CVE-2009-2699	High	7.5	14%	-	Fix
CVE-2004-0174	High	7.5	12%	-	-
CVE-2009-4272	High	7.5	11%	-	-
CVE-2020-24606	High	8.6	5.2%	-	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.