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Out-of-Bounds The advisory has been revoked - it doesn't affect any version of package kernel-cross-headers  (opens in a new tab)

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EPSS
0.55% (42nd percentile)

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  • Snyk IDSNYK-RHEL8-KERNELCROSSHEADERS-4180048
  • published26 Jul 2021
  • disclosed11 May 2021
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Introduced: 11 May 2021

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

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.

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).