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Red Hat Enterprise Linux 8: RHSA-2021:1081-01 Critical Kernel-RT Patch

red hat
Calendar Grey April 6, 2021
Dist Redhat Esm H88
Essential system update for CentOS 8 addresses several security vulnerabilities and bug problems promptly.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8

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-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 eventpoll.c may lead to escalation of privilege (CVE-2020-0466)
* kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)
* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)
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 possible livelock: WARNING: CPU: 28 PID: 3109 at kernel/ptrace.c:242 ptrace_check_attach+0xdd/0x1a0 (BZ#1925308)
* kernel-rt: update RT source tree to the RHEL-8.3.z3 source tree (BZ#1926369)

Topics%20covered

Topics Covered

security advisory security issue buffer overflow red hat critical bug fix security fix Red Hat Enterprise Linux important kernel-rt escalation of privilege

References

https://access.redhat.com/security/cve/CVE-2020-0466 https://access.redhat.com/security/cve/CVE-2020-27152 https://access.redhat.com/security/cve/CVE-2020-28374 https://access.redhat.com/security/cve/CVE-2021-3347 https://access.redhat.com/security/cve/CVE-2021-26708 https://access.redhat.com/security/cve/CVE-2021-27363 https://access.redhat.com/security/cve/CVE-2021-27364 https://access.redhat.com/security/cve/CVE-2021-27365 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source: kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.src.rpm
x86_64: kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-core-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-devel-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-kvm-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-modules-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debuginfo-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-devel-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-kvm-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-modules-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-modules-extra-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm
Red Hat Enterprise Linux Real Time (v. 8):
Source: kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.src.rpm
x86_64: kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:1081-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1081
Issue date: 2021-04-06

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.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 security issue buffer overflow red hat critical bug fix security fix Red Hat Enterprise Linux important kernel-rt escalation of privilege

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time (v. 8) - x86_64

Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64

Bugs Fixed

1888886 - CVE-2020-27152 Kernel: KVM: host stack overflow due to lazy update IOAPIC

1899804 - CVE-2020-28374 kernel: SCSI target (LIO) write to any block on ILO backstore

1920480 - CVE-2020-0466 kernel: use after free in eventpoll.c may lead to escalation of privilege

1922249 - CVE-2021-3347 kernel: Use after free via PI futex state

1925588 - CVE-2021-26708 kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c

1926369 - kernel-rt: update RT source tree to the RHEL-8.3.z3 source tree

1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem

1930079 - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles

1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

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