Out-of-Bounds Affecting kernel-headers package, versions <0:4.18.0-348.el8


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.05% (20th percentile)

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  • Snyk IDSNYK-CENTOS8-KERNELHEADERS-2135909
  • published26 Jul 2021
  • disclosed11 May 2021

Introduced: 11 May 2021

CVE-2021-3489  (opens in a new tab)
CWE-119  (opens in a new tab)

How to fix?

Upgrade Centos:8 kernel-headers to version 0:4.18.0-348.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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).

CVSS Scores

version 3.1