CVE-2020-35501 — kernel: audit not logging access to syscall open_by_handle_at for users with CAP_DAC_READ_SEARCH capability

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LOW

kernel: audit not logging access to syscall open_by_handle_at for users with CAP_DAC_READ_SEARCH capability

Published Mar 30, 2022

3.4

LOW

CVSS 3.1

EPSS 0.24%

Description

A flaw was found in the Linux kernels implementation of audit rules, where a syscall can unexpectedly not be correctly not be logged by the audit subsystem

Affected products

Vendor n/a Product Kernel Default
n/a
- Version
  affecting all versions up to kernel 5.17
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

n/a

Kernel

n/a

Version	Status	Constraints
affecting all versions up to kernel 5.17	affected	-

Red Hat Enterprise Linux 5

kernel

Out of support scope
Red Hat Enterprise Linux 6

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel

Fix deferred
Red Hat Enterprise Linux 7

kernel-alt

Out of support scope
Red Hat Enterprise Linux 7

kernel-rt

Fix deferred
Red Hat Enterprise Linux 8

kernel

Fix deferred
Red Hat Enterprise Linux 8

kernel-rt

Fix deferred
Red Hat Enterprise Linux 9

kernel

Fix deferred

Product	Package	State	Advisory
Red Hat Enterprise Linux 5	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 6	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 7	kernel-alt	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel-rt	Fix deferred	n/a
Red Hat Enterprise Linux 8	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 8	kernel-rt	Fix deferred	n/a
Red Hat Enterprise Linux 9	kernel	Fix deferred	n/a

Remediation

Red Hat mitigation

This syscall can still be audited by using the 'syscall auditing feature' by passing open_by_handle_at to it in the rule. Existing auditing ruleset requirements generally use this mechanism.

Metrics

0.24% 0.00241

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00241

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	0.24% (0.00241)	13.89th	v5 (v2026.06.15)
Jun 15, 2026	0.24% (0.00236)	14.30th	v5 (v2026.06.15)
Mar 17, 2025	0.01% (0.00012)	0.83th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00044)	14.58th	v3 (v2023.03.01)
Jun 13, 2024	0.04% (0.00044)	12.59th	v3 (v2023.03.01)
Oct 21, 2023	0.04% (0.00044)	10.58th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00043)	6.97th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 23, 2023	0.89% (0.00885)	27.85th	v2 (v2022.01.01)
Dec 28, 2022	1.40% (0.01404)	71.62th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Mar 31, 2022	0.89% (0.00885)	11.62th	v2 (v2022.01.01)

Weaknesses (1)

CWE-863

Incorrect Authorization

References (4)

https://access.redhat.com/security/cve/CVE-2020-35501
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1908577
Issue TrackingMitigationThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-35501
https://www.cve.org/CVERecord?id=CVE-2020-35501

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2020-35501		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1908577		Issue TrackingMitigationThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-35501
https://www.cve.org/CVERecord?id=CVE-2020-35501