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Red Hat Product Errata RHSA-2021:4875 - Security Advisory
Issued:
2021-11-30
Updated:
2021-11-30

RHSA-2021:4875 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.

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 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)

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

  • Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.2 x86_64
  • Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.2 x86_64

Fixes

  • BZ - 1974319 - CVE-2020-36385 kernel: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free
  • BZ - 2005258 - CVE-2021-20317 kernel: timer tree corruption leads to missing wakeup and system freeze

CVEs

  • CVE-2020-36385
  • CVE-2021-20317

References

  • https://access.redhat.com/security/updates/classification/#important
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.2

SRPM
kernel-rt-4.18.0-193.70.1.rt13.120.el8_2.src.rpm SHA-256: 13e2c6327c4e8d9d2ae2c5026e312a12297ba1b58c82c689c0ea9e1df984210b
x86_64
kernel-rt-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 3144f96dbc2ff40e7d6518b38a981c7a068809a03b1163a05ed39bc5ef2f6c3c
kernel-rt-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: cdb6648d9b4d5f36badfcda3843102dc7766980989c845fe74ea9e43df104ee9
kernel-rt-debug-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 8283e6212fe43bca477dcbfaf71ccc12a23d95adeae4f1358ca27e3aa13cef0e
kernel-rt-debug-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 16408685e560e9ad8d02ada1af0f022491b4986cf16b74a32ff7fa66e4973fb1
kernel-rt-debug-debuginfo-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: b37eee1c176a972b7d1bb5ae33e038ffcbe53f4fcc2b8d804e873f97f924bf70
kernel-rt-debug-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: a9487d1d047341940027bdc664e06f05f05ce09aade5c300cb6a5a8980a41e87
kernel-rt-debug-modules-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 25436cf927aa83c4361e78fa98e9fc7ba228c64f8b24721344f17375644d4a75
kernel-rt-debug-modules-extra-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 8cabff42857e571747fd87805ffdf9f581b0f3a7d00b129730026d56426df06f
kernel-rt-debuginfo-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: b3bac2d3867567a23b9d0954e0301f475fac0ff407ad30a93e6d7674c5c4a488
kernel-rt-debuginfo-common-x86_64-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 7a7eb74aa662ddd21d2ce09089f70f65b2750f9d496ae15c18a6bb1306b94f1d
kernel-rt-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: ac357857ec6ce0fa62b1c4a0ba5aaa657474ce33d3ecf1b3709d61b41d161fbc
kernel-rt-modules-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 80aaec247ae967e7a71049c9690ce1ed1404f0a4e13afe30d7e664c250d3b5d5
kernel-rt-modules-extra-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: fe46241f142049e7f6a12a06f779e9b2195dc992d950b1a247cb1fffea4d866a

Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.2

SRPM
kernel-rt-4.18.0-193.70.1.rt13.120.el8_2.src.rpm SHA-256: 13e2c6327c4e8d9d2ae2c5026e312a12297ba1b58c82c689c0ea9e1df984210b
x86_64
kernel-rt-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 3144f96dbc2ff40e7d6518b38a981c7a068809a03b1163a05ed39bc5ef2f6c3c
kernel-rt-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: cdb6648d9b4d5f36badfcda3843102dc7766980989c845fe74ea9e43df104ee9
kernel-rt-debug-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 8283e6212fe43bca477dcbfaf71ccc12a23d95adeae4f1358ca27e3aa13cef0e
kernel-rt-debug-core-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 16408685e560e9ad8d02ada1af0f022491b4986cf16b74a32ff7fa66e4973fb1
kernel-rt-debug-debuginfo-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: b37eee1c176a972b7d1bb5ae33e038ffcbe53f4fcc2b8d804e873f97f924bf70
kernel-rt-debug-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: a9487d1d047341940027bdc664e06f05f05ce09aade5c300cb6a5a8980a41e87
kernel-rt-debug-kvm-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 1a9479f03314d056c1247f1424b937c93ce5b98d0bd23224b24bd7152c7c1b6b
kernel-rt-debug-modules-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 25436cf927aa83c4361e78fa98e9fc7ba228c64f8b24721344f17375644d4a75
kernel-rt-debug-modules-extra-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 8cabff42857e571747fd87805ffdf9f581b0f3a7d00b129730026d56426df06f
kernel-rt-debuginfo-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: b3bac2d3867567a23b9d0954e0301f475fac0ff407ad30a93e6d7674c5c4a488
kernel-rt-debuginfo-common-x86_64-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 7a7eb74aa662ddd21d2ce09089f70f65b2750f9d496ae15c18a6bb1306b94f1d
kernel-rt-devel-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: ac357857ec6ce0fa62b1c4a0ba5aaa657474ce33d3ecf1b3709d61b41d161fbc
kernel-rt-kvm-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: c6ce2cd9702a282f2ea0efb6294ed0205be6a99035f3a94a547e473a3eb2c096
kernel-rt-modules-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: 80aaec247ae967e7a71049c9690ce1ed1404f0a4e13afe30d7e664c250d3b5d5
kernel-rt-modules-extra-4.18.0-193.70.1.rt13.120.el8_2.x86_64.rpm SHA-256: fe46241f142049e7f6a12a06f779e9b2195dc992d950b1a247cb1fffea4d866a

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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