Off-by-one Error Affecting kernel-uek-devel package, versions <0:4.14.35-2047.503.1.el7uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-ORACLE7-KERNELUEKDEVEL-2598762
  • published10 Apr 2022
  • disclosed20 Mar 2021

Introduced: 20 Mar 2021

CVE-2020-27171  (opens in a new tab)
CWE-193  (opens in a new tab)

How to fix?

Upgrade Oracle:7 kernel-uek-devel to version 0:4.14.35-2047.503.1.el7uek or higher.
This issue was patched in ELSA-2021-9222.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-devel package and not the kernel-uek-devel package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

CVSS Scores

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