Issued:

2021-04-06

Updated:

2021-04-06

RHSA-2021:1081 - Important: kernel-rt security and bug fix update

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory Important

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 impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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)

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.

Affected Products

Updated Packages

• kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.src.rpm
• kernel-rt-devel-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-debug-devel-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-modules-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-kvm-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-modules-extra-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-debuginfo-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-debug-debuginfo-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm
• kernel-rt-4.18.0-240.22.1.rt7.77.el8_3.x86_64.rpm

Fixes

• This content is not included.BZ - 1888886
• This content is not included.BZ - 1899804
• This content is not included.BZ - 1920480
• This content is not included.BZ - 1922249
• This content is not included.BZ - 1925588
• This content is not included.BZ - 1926369
• This content is not included.BZ - 1930078
• This content is not included.BZ - 1930079
• This content is not included.BZ - 1930080

CVEs

• CVE-2020-0466
• CVE-2020-27152
• CVE-2020-28374
• CVE-2021-3347
• CVE-2021-26708
• CVE-2021-27363
• CVE-2021-27364
• CVE-2021-27365

References

• https://access.redhat.com/security/updates/classification/#important

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.