Out-of-bounds Read Affecting kernel-debuginfo-common-x86_64 package, versions <0:4.14.232-176.381.amzn2


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    0.05% (21st percentile)

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  • Snyk ID SNYK-AMZN2-KERNELDEBUGINFOCOMMONX8664-1699041
  • published 27 Sep 2021
  • disclosed 20 Apr 2021

How to fix?

Upgrade Amazon-Linux:2 kernel-debuginfo-common-x86_64 to version 0:4.14.232-176.381.amzn2 or higher.
This issue was patched in ALAS2-2021-1636.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo-common-x86_64 package and not the kernel-debuginfo-common-x86_64 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

References

CVSS Scores

version 3.1
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NVD

5.5 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    None
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Red Hat

4.4 medium
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SUSE

6.2 medium