Out-of-bounds Write Affecting torvalds/linux package, versions [5.8,5.10.37)[5.11,5.11.21)[5.12,5.12.4)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.03% (6th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3004932
  • published26 Jan 2022
  • disclosed4 Jun 2021
  • creditUnknown

Introduced: 4 Jun 2021

CVE-2021-3489  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.10.37, 5.11.21, 5.12.4 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Write. 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).

References

CVSS Base Scores

version 3.1