Out-of-bounds Read Affecting torvalds/linux package, versions [5.10,5.10.37)[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
3.76% (88th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3005959
  • published26 Jan 2022
  • disclosed4 Jun 2021
  • creditUnknown

Introduced: 4 Jun 2021

CVE-2021-3490  (opens in a new tab)
CWE-125  (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 Read. The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).

References

CVSS Base Scores

version 3.1