Detections
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RHEL 8 : kernel (RHSA-2021:5227)
medium Nessus Plugin ID 156247
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Synopsis
The remote Red Hat host is missing a security update for kernel.Description
The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:5227 advisory.The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename() (CVE-2021-20321)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* panic while breaking a lease/delegation after user mode helper invocation (BZ#2010333)
* The ASR driver is causing a system crash in RHEL8.4 compared to RHEL8.3 due to kernel changes (BZ#2016384)
* RHEL8: DFS provided SMB shares are not accessible following unprivileged access (BZ#2017177)
* Avoid hitting the rtnl_trylock/restart_syscall logic in net-sysfs when possible (BZ#2021165)
* RHEL8: x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT (BZ#2024678)
* RHEL8.4-[Regression][P10][DD2.0][Rainier/Denali] - system crashed while offlining and onlining cores (BZ#2026450)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
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 RHEL kernel package based on the guidance in RHSA-2021:5227.See Also
http://www.nessus.org/u?1a8ef322
https://access.redhat.com/security/updates/classification/#moderate
Plugin Details
Severity: Medium
ID: 156247
File Name: redhat-RHSA-2021-5227.nasl
Version: 1.10
Type: local
Agent: unix
Family: Red Hat Local Security Checks
Published: 12/22/2021
Updated: 11/7/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
Vendor
Vendor Severity: Moderate
CVSS v2
Risk Factor: Medium
Base Score: 4.7
Temporal Score: 3.5
Vector: CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2021-20321
CVSS v3
Risk Factor: Medium
Base Score: 4.7
Temporal Score: 4.1
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:kernel-debug-core, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-cross-headers, p-cpe:/a:redhat:enterprise_linux:kernel-core, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs, p-cpe:/a:redhat:enterprise_linux:perf, p-cpe:/a:redhat:enterprise_linux:bpftool, p-cpe:/a:redhat:enterprise_linux:kernel-tools, p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump, p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-core, p-cpe:/a:redhat:enterprise_linux:kernel, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-modules, p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-modules, p-cpe:/a:redhat:enterprise_linux:kernel-zfcpdump-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:python3-perf
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 12/21/2021
Vulnerability Publication Date: 12/21/2021
Reference Information
CVE: CVE-2021-20321