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redhatRedHatRHSA-2021:3375
HistoryAug 31, 2021 - 8:22 a.m.

(RHSA-2021:3375) Important: kernel-rt security and bug fix update

2021-08-3108:22:22
access.redhat.com
87

CVSS2

6.9

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.3

Attack Vector

ADJACENT

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:H/PR:N/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

0.002

Percentile

59.5%

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: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)

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

  • kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)

  • kernel: race condition for removal of the HCI controller (CVE-2021-32399)

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.z11 Batch source tree (BZ#1984586)
OSVersionArchitecturePackageVersionFilename
RedHat8x86_64kernel-rt< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-modules-extra< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-modules-extra-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-kvm< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-kvm-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-debuginfo< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-debuginfo-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-core< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-devel< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-devel-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-core< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-modules< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-modules-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
RedHat8x86_64kernel-rt-debug-kvm< 4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-kvm-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
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CVSS2

6.9

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

8.3

Attack Vector

ADJACENT

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:H/PR:N/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

0.002

Percentile

59.5%

JSON
Related for RHSA-2021:3375
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