Is CVE-2021-3715 in the CISA KEV catalog?

No. CVE-2021-3715 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3715?

CVE-2021-3715 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-3715?

CVE-2021-3715 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3715?

Upgrade linux on debian 11 to 5.5.17-1 or later. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3715

HIGH

7.8

CVSS v3

NVD

Description

A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE-416Use After Free

How to fix

Remediation Available

linuxDebian

Fixed in:5.5.17-1CVE-2021-3715

gcpUbuntu

Fixed in:5.4.0-1009LSN-0082-1

generic-4.15Ubuntu

Fixed in:4.15.0-143LSN-0082-1

Fixed in:4.15.0-69LSN-0082-1

generic-4.4Ubuntu

Fixed in:4.4.0-211LSN-0082-1

generic-5.4Ubuntu

Fixed in:5.4.0-26LSN-0082-1

gkeUbuntu

Fixed in:5.4.0-1033LSN-0082-1

gke-4.15Ubuntu

Fixed in:4.15.0-1076LSN-0082-1

gke-5.4Ubuntu

Fixed in:5.4.0-1009LSN-0082-1

gkeopUbuntu

Fixed in:5.4.0-1009LSN-0082-1

gkeop-5.4Ubuntu

Fixed in:5.4.0-1007LSN-0082-1

lowlatency-4.15Ubuntu

Fixed in:4.15.0-143LSN-0082-1

Fixed in:4.15.0-69LSN-0082-1

lowlatency-4.4Ubuntu

Fixed in:4.4.0-211LSN-0082-1

lowlatency-5.4Ubuntu

Fixed in:5.4.0-26LSN-0082-1

oemUbuntu

Fixed in:4.15.0-1063LSN-0082-1

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch1

git.kernel.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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.