Out-of-bounds Write Affecting torvalds/linux package, versions [,5.12.8)


Severity

Recommended
0.0
high
0
10

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

Threat Intelligence

EPSS
0.04% (10th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3005190
  • published26 Jan 2022
  • disclosed27 May 2021
  • creditUnknown

Introduced: 27 May 2021

CVE-2021-33200  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.12.8 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Write kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

CVSS Base Scores

version 3.1