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redhatRedHatRHSA-2021:3802
HistoryOct 12, 2021 - 1:21 p.m.

(RHSA-2021:3802) Important: kernel-rt security and bug fix update

2021-10-1213:21:33
access.redhat.com
27

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS4

8.7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/SC:H/VI:H/SI:H/VA:L/SA:L

EPSS

0.001

Percentile

23.5%

JSON

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

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

  • 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):

  • Indefinite waiting for RCU callback while removing cgroup (BZ#1967844)

  • kernel-rt: update to the latest RHEL7.9.z9 source tree (BZ#2002994)

OSVersionArchitecturePackageVersionFilename
RedHat7x86_64kernel-rt-debug-kvm< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-debug-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-debug< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-debug-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-trace-debuginfo< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-trace-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7noarchkernel-rt-doc< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-doc-3.10.0-1160.45.1.rt56.1185.el7.noarch.rpm
RedHat7x86_64kernel-rt-kvm-debuginfo< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-kvm-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-debuginfo-common-x86_64< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-debuginfo-common-x86_64-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-kvm< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-debuginfo< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-debug-debuginfo< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-debug-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
RedHat7x86_64kernel-rt-trace-kvm< 3.10.0-1160.45.1.rt56.1185.el7kernel-rt-trace-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
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CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS4

8.7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/SC:H/VI:H/SI:H/VA:L/SA:L

EPSS

0.001

Percentile

23.5%

JSON
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