CVE & CISA-KEV Catalog

CVE-2021-3489

HIGH
7.8
CVSS v3
NVD

Description

The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).

CWE-119Buffer OverflowCWE-787Out-of-bounds Write

How to fix

Remediation Available
linuxDebian
Fixed in:5.10.38-1CVE-2021-3489
Fixed in:5.10.38-1CVE-2021-3489
Fixed in:5.10.38-1CVE-2021-3489
Fixed in:5.10.38-1CVE-2021-3489
linux-hwe-5.8Ubuntu
Fixed in:5.8.0-53.60~20.04.1USN-4949-1
linux-image-5.10.0-1026-oemUbuntu
Fixed in:5.10.0-1026.27USN-4948-1
linux-image-5.8.0-53-genericUbuntu
Fixed in:5.8.0-53.60~20.04.1USN-4949-1
linux-image-5.8.0-53-generic-64kUbuntu
Fixed in:5.8.0-53.60~20.04.1USN-4949-1
linux-image-5.8.0-53-generic-lpaeUbuntu
Fixed in:5.8.0-53.60~20.04.1USN-4949-1
linux-image-5.8.0-53-lowlatencyUbuntu
Fixed in:5.8.0-53.60~20.04.1USN-4949-1
linux-image-generic-64k-hwe-20.04Ubuntu
Fixed in:5.8.0.53.60~20.04.37USN-4949-1
linux-image-generic-hwe-20.04Ubuntu
Fixed in:5.8.0.53.60~20.04.37USN-4949-1
linux-image-generic-lpae-hwe-20.04Ubuntu
Fixed in:5.8.0.53.60~20.04.37USN-4949-1
linux-image-lowlatency-hwe-20.04Ubuntu
Fixed in:5.8.0.53.60~20.04.37USN-4949-1
linux-image-oem-20.04bUbuntu
Fixed in:5.10.0.1026.27USN-4948-1
linux-image-virtual-hwe-20.04Ubuntu
Fixed in:5.8.0.53.60~20.04.37USN-4949-1
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 ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

0.55%probability of exploitation in 30 days
42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-4966Critical9.4100%KEV + RansomFix
CVE-2017-11882High7.8100%KEV + Ransom-
CVE-2020-0796Critical10.0100%KEV + Ransom-
CVE-2008-4250Critical9.899%KEV-
CVE-2017-15944Critical9.898%KEVFix
CVE-2015-0014High10.097%--
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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.