CVE-2020-27171

Advisory lineage Upstream: 0 Downstream: 23
Modified
Published: 20 Mar 2021, 21:41
Last modified:04 Aug 2024, 16:11

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
6 MEDIUM
v3.1 (nvd)
EPSS Score
0.18% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Mar 2021, 21:41
Published
Vulnerability first disclosed
04 Aug 2024, 16:11
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•MEDIUM•Score: 6CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
  • v2.0•LOW•Score: 3.6AV:L/AC:L/Au:N/C:P/I:N/A:P

EPSS Trends

Current EPSS score: 0.18%• Percentile: 39%

Techniques & Countermeasures

  • CWE-193•Off-by-one Error

    A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04 | 20.04

  • debian•debian_linux

    9.0

  • fedoraproject•fedora

    32 | 33 | 34

  • linux•linux_kernel

    < 5.11.8

References (9)