CVE & CISA-KEV Catalog

CVE-2021-45402

MEDIUM
5.5
CVSS v3
NVD

Description

The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

CWE-668

How to fix

Remediation Available
linuxDebian
Fixed in:5.10.92-1CVE-2021-45402
Fixed in:5.15.15-1CVE-2021-45402
Fixed in:5.15.15-1CVE-2021-45402
Fixed in:5.15.15-1CVE-2021-45402
linux-aws-5.13Ubuntu
Fixed in:5.13.0-1019.21~20.04.1USN-5337-1
linux-azure-5.13Ubuntu
Fixed in:5.13.0-1021.24~20.04.1USN-5368-1
linux-gcp-5.13Ubuntu
Fixed in:5.13.0-1021.25~20.04.1USN-5337-1
linux-hwe-5.13Ubuntu
Fixed in:5.13.0-37.42~20.04.1USN-5337-1
linux-image-5.13.0-1019-awsUbuntu
Fixed in:5.13.0-1019.21~20.04.1USN-5337-1
linux-image-5.13.0-1021-azureUbuntu
Fixed in:5.13.0-1021.24~20.04.1USN-5368-1
linux-image-5.13.0-1021-gcpUbuntu
Fixed in:5.13.0-1021.25~20.04.1USN-5337-1
linux-image-5.13.0-1025-oracleUbuntu
Fixed in:5.13.0-1025.30~20.04.1USN-5368-1
linux-image-5.13.0-37-genericUbuntu
Fixed in:5.13.0-37.42~20.04.1USN-5337-1
linux-image-5.13.0-37-generic-64kUbuntu
Fixed in:5.13.0-37.42~20.04.1USN-5337-1
linux-image-5.13.0-37-generic-lpaeUbuntu
Fixed in:5.13.0-37.42~20.04.1USN-5337-1
linux-image-5.13.0-37-lowlatencyUbuntu
Fixed in:5.13.0-37.42~20.04.1USN-5337-1
linux-image-awsUbuntu
Fixed in:5.13.0.1019.21~20.04.12USN-5337-1
linux-image-azureUbuntu
Fixed in:5.13.0.1021.24~20.04.10USN-5368-1
linux-image-gcpUbuntu
Fixed in:5.13.0.1021.25~20.04.1USN-5337-1
linux-image-generic-64k-hwe-20.04Ubuntu
Fixed in:5.13.0.37.42~20.04.22USN-5337-1
linux-image-generic-hwe-20.04Ubuntu
Fixed in:5.13.0.37.42~20.04.22USN-5337-1
linux-image-generic-lpae-hwe-20.04Ubuntu
Fixed in:5.13.0.37.42~20.04.22USN-5337-1
linux-image-lowlatency-hwe-20.04Ubuntu
Fixed in:5.13.0.37.42~20.04.22USN-5337-1
linux-image-oracleUbuntu
Fixed in:5.13.0.1025.30~20.04.1USN-5368-1
linux-image-virtual-hwe-20.04Ubuntu
Fixed in:5.13.0.37.42~20.04.22USN-5337-1
linux-oracle-5.13Ubuntu
Fixed in:5.13.0-1025.30~20.04.1USN-5368-1

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
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.42%probability of exploitation in 30 days
34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Related Vulnerabilities

Other CWE-668 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2022-39952Critical9.8100%-Fix
CVE-2017-16597Critical9.857%--
CVE-2017-16603High8.854%--
CVE-2024-25153Critical9.842%-Fix
CVE-2017-0215Medium5.336%--
CVE-2022-25236Critical9.834%-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.