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Out-of-bounds Read The advisory has been revoked - it doesn't affect any version of package perf  (opens in a new tab)

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EPSS
0.61% (45th percentile)

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  • Snyk IDSNYK-RHEL7-PERF-1408756
  • published26 Jul 2021
  • disclosed13 Feb 2021
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Introduced: 13 Feb 2021

CVE-2021-3444  (opens in a new tab)
CWE-125  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.