Detections
Analytics
RHEL 7 : kernel (RHSA-2021:3987)
high Nessus Plugin ID 154668
Language:
Synopsis
The remote Red Hat host is missing one or more security updates for kernel.Description
The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3987 advisory.The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385)
* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
* kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
* kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)
* kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656)
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):
* A race between i40e_ndo_set_vf_mac() and i40e_vsi_clear() in the i40e driver causes a use after free condition of the kmalloc-4096 slab cache. (BZ#1980333)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
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 RHEL kernel package based on the guidance in RHSA-2021:3987.See Also
http://www.nessus.org/u?d89c309a
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/errata/RHSA-2021:3987
https://bugzilla.redhat.com/show_bug.cgi?id=1902788
https://bugzilla.redhat.com/show_bug.cgi?id=1965461
https://bugzilla.redhat.com/show_bug.cgi?id=1974319
https://bugzilla.redhat.com/show_bug.cgi?id=1983686
Plugin Details
Severity: High
ID: 154668
File Name: redhat-RHSA-2021-3987.nasl
Version: 1.11
Type: local
Agent: unix
Family: Red Hat Local Security Checks
Published: 10/28/2021
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: High
Score: 7.3
Vendor
Vendor Severity: Important
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2021-37576
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.9
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2021-3656
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 7.2
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
CVSS Score Source: CVE-2021-22543
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:bpftool, p-cpe:/a:redhat:enterprise_linux:kernel-tools, p-cpe:/a:redhat:enterprise_linux:kernel-headers, cpe:/o:redhat:rhel_e4s:7.7, cpe:/o:redhat:rhel_aus:7.7, p-cpe:/a:redhat:enterprise_linux:kernel-devel, 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-bootwrapper, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs, p-cpe:/a:redhat:enterprise_linux:python-perf, p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-debug, cpe:/o:redhat:rhel_tus:7.7, p-cpe:/a:redhat:enterprise_linux:perf
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: 10/26/2021
Vulnerability Publication Date: 10/18/2020
Reference Information
CVE: CVE-2019-20934, CVE-2020-36385, CVE-2021-22543, CVE-2021-3653, CVE-2021-3656, CVE-2021-37576