CVE-2020-27170

Advisory lineage Upstream: 0 Downstream: 25
Modified
Published: 20 Mar 2021, 21:30
Last modified:04 Aug 2024, 16:11

Vulnerability Summary

Overall Risk (default)
low
19/100
CVSS Score
4.7 MEDIUM
v3.1 (nvd)
EPSS Score
0.15% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Mar 2021, 21:30
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 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, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
  • v2.0•LOW•Score: 1.9AV:L/AC:M/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.15%• Percentile: 35%

Techniques & Countermeasures

  • CWE-203•Observable Discrepancy

    The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

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)