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Red Hat Enterprise Linux 7 RHSA-2021:3801-01 Crucial Kernel Security Patch

red hat
Calendar Grey October 12, 2021
Dist Redhat Esm H88
Debian has released an essential software patch that tackles critical security flaws and performance issues. Update promptly for enhanced security.
An update for kernel is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* 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: 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):
* Kernel panic due to double fault with DLM reporting for socket error "sk_err=32/0" (BZ#1834878)
* "MFW indication via attention" message getting logged frequently after every 5 minutes (BZ#1854544)
* lpfc fails to discovery in pt2pt with "2754 PRLI failure DID:0000EF Status:x9/x91e00, data: x0" (BZ#1922479)
* pcpu_get_vm_areas using most memory from VmallocUsed (BZ#1970618)
* RHEL 7.9.z [qedf driver] Racing condition between qedf_cleanup_fcport and releasing command after timeout (BZ#1982702)
* [Azure] RHEL 7.9 reports GPU/IB topology incorrectly on some Azure SKUs (BZ#1984128)
* [stable guest ABI]Hot add CPU after migration cause guest hang (BZ#1991856)
* i40e driver crash at RIP: i40e_config_vf_promiscuous_mode+0x165 (BZ#1993850)
* [nfs] Performance issue since commit 5a4f6f11951e (BZ#1995649)
* [kernel] Indefinite waiting for RCU callback while removing cgroup (BZ#2000973)

Topics%20covered

Topics Covered

security advisory memory corruption Red Hat Enterprise Linux important kernel bug fixes KVM

References

https://access.redhat.com/security/cve/CVE-2021-3653 https://access.redhat.com/security/cve/CVE-2021-3656 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-37576 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: kernel-3.10.0-1160.45.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-1160.45.1.el7.noarch.rpm kernel-doc-3.10.0-1160.45.1.el7.noarch.rpm
x86_64: bpftool-3.10.0-1160.45.1.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-headers-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.x86_64.rpm perf-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3801-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3801
Issue date: 2021-10-12

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory memory corruption Red Hat Enterprise Linux important kernel bug fixes KVM

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks

1983686 - CVE-2021-3653 kernel: SVM nested virtualization issue in KVM (AVIC support)

1983988 - CVE-2021-3656 kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE)

1986506 - CVE-2021-37576 kernel: powerpc: KVM guest OS users can cause host OS memory corruption

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