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CentOS Linux 8.5 [TuxCare] Security Update: bpftool / kernel / kernel-core / kernel-cross-headers / etc Multiple Vulnerabilities (CENTOS8.5:CLSA-2023:1686651204)
high Nessus Plugin ID 366968
Synopsis
The CentOS Linux host is missing one or more security updates.Description
The CentOS Linux 8.5 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.5:CLSA-2023:1686651204 advisory.- A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. (CVE-2021-20322)
- When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds. (CVE-2021-33655)
- When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
(CVE-2021-33656)
- A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system. (CVE-2021-4028)
- An unprivileged write to the file handler flaw in the Linux kernel's control groups and namespaces subsystem was found in the way users have access to some less privileged process that are controlled by cgroups and have higher privileged parent process. It is actually both for cgroup2 and cgroup1 versions of control groups. A local user could use this flaw to crash the system or escalate their privileges on the system. (CVE-2021-4197)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages based on the guidance in TuxCare advisory CENTOS8.5:CLSA-2023:1686651204.See Also
Plugin Details
Severity: High
ID: 366968
File Name: tuxcare_centos_8.5_CLSA-2023-1686651204.nasl
Version: 1.1
Type: Local
Agent: unix
Family: CentOS Local Security Checks
Published: 10/18/2026
Updated: 10/18/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 9.5
Percentile: 99.87
Vendor
Vendor Severity: Important
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 6.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2022-29581
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 8.4
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C
CVSS Score Source: CVE-2022-42896
CVSS v4
Risk Factor: High
Base Score: 8.6
Threat Score: 8.6
Threat Vector: CVSS:4.0/E:A
Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CVSS Score Source: CVE-2022-1055
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/13/2023
Vulnerability Publication Date: 7/21/2021
CISA Known Exploited Vulnerability Due Dates: 7/8/2025, 6/5/2026
Reference Information
CVE: CVE-2021-20322, CVE-2021-33655, CVE-2021-33656, CVE-2021-4028, CVE-2021-4197, CVE-2022-0492, CVE-2022-1055, CVE-2022-1158, CVE-2022-2196, CVE-2022-25636, CVE-2022-2873, CVE-2022-28893, CVE-2022-2938, CVE-2022-29581, CVE-2022-2964, CVE-2022-3625, CVE-2022-42896, CVE-2022-48805, CVE-2022-50394, CVE-2023-0386, CVE-2023-1281, CVE-2023-1380, CVE-2023-1513, CVE-2023-1989, CVE-2023-28772, CVE-2023-30456, CVE-2023-31436, CVE-2023-53213
CLSA: 2023:1686651204