CVE & CISA-KEV Catalog

CVE-2021-20268

HIGH
7.8
CVSS v3
NVD

Description

An out-of-bounds access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE-20Improper Input ValidationCWE-190Integer Overflow

How to fix

Remediation Available
linuxDebian
Fixed in:5.10.12-1CVE-2021-20268
Fixed in:5.10.12-1CVE-2021-20268
Fixed in:5.10.12-1CVE-2021-20268
Fixed in:5.10.12-1CVE-2021-20268
linux-hwe-5.8Ubuntu
Fixed in:5.8.0-49.55~20.04.1USN-4910-1
linux-image-5.8.0-49-genericUbuntu
Fixed in:5.8.0-49.55~20.04.1USN-4910-1
linux-image-5.8.0-49-generic-64kUbuntu
Fixed in:5.8.0-49.55~20.04.1USN-4910-1
linux-image-5.8.0-49-generic-lpaeUbuntu
Fixed in:5.8.0-49.55~20.04.1USN-4910-1
linux-image-5.8.0-49-lowlatencyUbuntu
Fixed in:5.8.0-49.55~20.04.1USN-4910-1
linux-image-generic-64k-hwe-20.04Ubuntu
Fixed in:5.8.0.49.55~20.04.33USN-4910-1
linux-image-generic-hwe-20.04Ubuntu
Fixed in:5.8.0.49.55~20.04.33USN-4910-1
linux-image-generic-lpae-hwe-20.04Ubuntu
Fixed in:5.8.0.49.55~20.04.33USN-4910-1
linux-image-lowlatency-hwe-20.04Ubuntu
Fixed in:5.8.0.49.55~20.04.33USN-4910-1
linux-image-virtual-hwe-20.04Ubuntu
Fixed in:5.8.0.49.55~20.04.33USN-4910-1

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

0.32%probability of exploitation in 30 days
24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Third-Party Advisory1
Other references1

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-3400Critical10.0100%KEV + Ransom-
CVE-2021-45105Medium5.9100%-Fix
CVE-2021-44228Critical10.0100%KEV + RansomFix
CVE-2021-21985Critical9.8100%KEV + RansomFix
CVE-2018-7600Critical9.8100%KEV + RansomFix
CVE-2020-3452High7.5100%KEVFix
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Markdown

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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.