RHEL 8 : kernel-rt (RHSA-2021:2719)

high Nessus Plugin ID 151856
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2719 advisory.

- kernel: perf_event_parse_addr_filter memory (CVE-2020-25704)

- kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)

- kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent (CVE-2020-35508)

- kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)

- kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://cwe.mitre.org/data/definitions/200.html

https://cwe.mitre.org/data/definitions/347.html

https://cwe.mitre.org/data/definitions/400.html

https://cwe.mitre.org/data/definitions/416.html

https://cwe.mitre.org/data/definitions/665.html

https://cwe.mitre.org/data/definitions/787.html

https://access.redhat.com/security/cve/CVE-2020-25704

https://access.redhat.com/security/cve/CVE-2020-26541

https://access.redhat.com/security/cve/CVE-2020-35508

https://access.redhat.com/security/cve/CVE-2021-33034

https://access.redhat.com/security/cve/CVE-2021-33909

https://access.redhat.com/errata/RHSA-2021:2719

https://bugzilla.redhat.com/1886285

https://bugzilla.redhat.com/1895961

https://bugzilla.redhat.com/1902724

https://bugzilla.redhat.com/1961305

https://bugzilla.redhat.com/1970273

Plugin Details

Severity: High

ID: 151856

File Name: redhat-RHSA-2021-2719.nasl

Version: 1.7

Type: local

Agent: unix

Published: 7/21/2021

Updated: 10/7/2021

Dependencies: ssh_get_info.nasl, redhat_repos.nasl, linux_alt_patch_detect.nasl

Risk Information

CVSS Score Source: CVE-2021-33909

VPR

Risk Factor: Critical

Score: 9.5

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:rhel_aus:8.2, cpe:/o:redhat:rhel_e4s:8.2, cpe:/o:redhat:rhel_eus:8.2, cpe:/o:redhat:rhel_tus:8.2, p-cpe:/a:redhat:enterprise_linux:kernel-rt, p-cpe:/a:redhat:enterprise_linux:kernel-rt-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules-extra

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/20/2021

Vulnerability Publication Date: 10/2/2020

Reference Information

CVE: CVE-2020-25704, CVE-2020-26541, CVE-2020-35508, CVE-2021-33034, CVE-2021-33909

RHSA: 2021:2719

IAVA: 2021-A-0350

CWE: 200, 347, 400, 416, 665, 787