Is CVE-2021-43057 in the CISA KEV catalog?

No. CVE-2021-43057 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43057?

CVE-2021-43057 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-43057?

CVE-2021-43057 has an EPSS score of 0.47% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43057?

Upgrade linux on debian 12 to 5.14.9-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-43057

HIGH

7.8

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.

CWE-416Use After Free

How to fix

Remediation Available

linuxDebian

Fixed in:5.14.9-1CVE-2021-43057

linux-image-5.13.0-1020-oemUbuntu

Fixed in:5.13.0-1020.24USN-5162-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1020.24USN-5162-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1020.24USN-5162-1

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

0.47%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Patch3

Third-Party Advisory1

security.netapp.com

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.