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redhatRedHatRHSA-2021:4875
HistoryNov 30, 2021 - 3:20 p.m.

(RHSA-2021:4875) Important: kernel-rt security and bug fix update

2021-11-3015:20:30
access.redhat.com
29

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

46.9%

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: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385)

  • kernel: timer tree corruption leads to missing wakeup and system freeze (CVE-2021-20317)

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-rt: update RT source tree to the latest RHEL-8.2.z13 Batch source tree (BZ#2020969)
OSVersionArchitecturePackageVersionFilename
RedHat8x86_64kernel-rt-debug-core< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debug-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-core< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-modules< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-modules-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debug-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-kvm< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debug-kvm-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-debuginfo< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debug-debuginfo-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-devel< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debug-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-devel< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debuginfo-common-x86_64< 4.18.0-193.70.1.rt13.120.el8_2kernel-rt-debuginfo-common-x86_64-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm
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7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

46.9%

JSON
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