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Vulnerability details: VCID-mdz8-ped6-67c5
Vulnerability ID VCID-mdz8-ped6-67c5
Aliases CVE-2020-27171
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-191 Integer Underflow (Wrap or Wraparound)
System Score Found at
cvssv3 6.0 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27171.json
epss 0.00179 https://api.first.org/data/v1/epss?cve=CVE-2020-27171
archlinux Medium https://security.archlinux.org/AVG-1711
archlinux Medium https://security.archlinux.org/AVG-1712
archlinux Medium https://security.archlinux.org/AVG-1713
archlinux Medium https://security.archlinux.org/AVG-1714
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27171.json
https://api.first.org/data/v1/epss?cve=CVE-2020-27171
1940623 https://bugzilla.redhat.com/show_bug.cgi?id=1940623
AVG-1711 https://security.archlinux.org/AVG-1711
AVG-1712 https://security.archlinux.org/AVG-1712
AVG-1713 https://security.archlinux.org/AVG-1713
AVG-1714 https://security.archlinux.org/AVG-1714
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27171.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.39189
EPSS Score 0.00179
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:43:24.005343+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0