A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 8.2.
RHSA-2021:2719-01: Important: kernel-rt security and bug fix update
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:2719-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2719
Issue date: 2021-07-20
CVE Names: CVE-2020-25704 CVE-2020-26541 CVE-2020-35508
CVE-2021-33034 CVE-2021-33909
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1. Summary:
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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Real Time EUS (v. 8.2) - x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) - x86_64
3. 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: size_t-to-int conversion vulnerability in the filesystem layer
(CVE-2021-33909)
* kernel: use-after-free in net/bluetooth/hci_event.c when destroying an
hci_chan (CVE-2021-33034)
* kernel: perf_event_parse_addr_filter memory (CVE-2020-25704)
* kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
(CVE-2020-26541)
* kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting
- ->real_parent (CVE-2020-35508)
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.z10 Batch source
tree (BZ#1968022)
4. 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.
5. Bugs fixed ( https://bugzilla.redhat.com/):
1886285 - CVE-2020-26541 kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
1895961 - CVE-2020-25704 kernel: perf_event_parse_addr_filter memory
1902724 - CVE-2020-35508 kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent
1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan
1968022 - kernel-rt: update RT source tree to the latest RHEL-8.2.z10 Batch source tree
1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the filesystem layer
6. Package List:
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.60.2.rt13.112.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.60.2.rt13.112.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.60.2.rt13.112.el8_2.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2020-25704
https://access.redhat.com/security/cve/CVE-2020-26541
https://access.redhat.com/security/cve/CVE-2020-35508
https://access.redhat.com/security/cve/CVE-2021-33034
https://access.redhat.com/security/cve/CVE-2021-33909
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/RHSB-2021-006
8. Contact:
The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
