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redhatRedHatRHSA-2021:5241
HistoryDec 21, 2021 - 9:12 a.m.

(RHSA-2021:5241) Moderate: kernel-rt security and bug fix update

2021-12-2109:12:29
access.redhat.com
29

4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.7 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.0004 Low

EPSS

Percentile

5.3%

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: 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):

  • kernel-rt: update RT source tree to the RHEL-8.5.z1 source tree (BZ#2023988)

  • [rt] RHEL-8.6: disable KASAN, KCSAN and UBSAN for kernel-rt (BZ#2026384)

OSVersionArchitecturePackageVersionFilename
RedHat8x86_64kernel-rt-debug-core< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-debug-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-debug-modules-extra< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-debug-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-core< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-kvm< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-kvm-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-debug< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-debug-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-debuginfo< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-debuginfo-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-devel< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-devel-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-debug-kvm< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-debug-kvm-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
RedHat8x86_64kernel-rt-modules-extra< 4.18.0-348.7.1.rt7.137.el8_5kernel-rt-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm
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4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.7 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.0004 Low

EPSS

Percentile

5.3%

JSON
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