RHSA-2021:2666: Important: kernel security and bug fix update
First published: Wed Jul 07 2021(Updated: )
The kernel packages contain the Linux kernel, the core of any Linux operating system.<br>Security Fix(es):<br><li> kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)</li> <li> kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)</li> 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.<br>Bug Fix(es):<br><li> [Azure][RHEL8.4] Two Patches Needed To Enable Azure Host Time-syncing in VMs (BZ#1963052)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-abi-whitelists | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-cross-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-doc | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-libs | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-cross-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debuginfo-common-s390x | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-zfcpdump-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-cross-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-core | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debug-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-debuginfo-common-ppc64le | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-headers | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-modules-extra | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-libs | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/python3-perf-debuginfo | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/bpftool | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/bpftool-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-core | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-cross-headers | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug-core | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug-devel | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug-modules | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debug-modules-extra | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-debuginfo-common-aarch64 | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-devel | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-headers | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-modules | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-modules-extra | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-tools | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-tools-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-tools-libs | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/perf | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/perf-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/python3-perf | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/python3-perf-debuginfo | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
| redhat/kernel-tools-libs-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-libs-devel | <4.18.0-147.51.1.el8_1 | 4.18.0-147.51.1.el8_1 |
| redhat/kernel-tools-libs-devel | <4.18.0-147.51.1.el8_1.aa | 4.18.0-147.51.1.el8_1.aa |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:2666?
The severity of RHSA-2021:2666 is classified as important.
How do I fix RHSA-2021:2666?
To fix RHSA-2021:2666, update the kernel packages to version 4.18.0-147.51.1.el8_1.
What vulnerabilities are addressed in RHSA-2021:2666?
RHSA-2021:2666 addresses a use-after-free vulnerability in the Bluetooth subsystem (CVE-2021-33034) and a security bypass related to the kernel authentication process.
Which systems are affected by RHSA-2021:2666?
RHSA-2021:2666 affects systems using the kernel version prior to 4.18.0-147.51.1.el8_1.
Is there a workaround for RHSA-2021:2666?
No specific workaround is provided for RHSA-2021:2666; updating to the fixed version is recommended.
- agent/references
- agent/severity
- agent/type
- agent/first-publish-date
- agent/last-modified-date
- agent/softwarecombine
- agent/remedy
- agent/weakness
- agent/title
- agent/description
- agent/event
- agent/trending
- agent/source
- agent/tags
- collector/redhat-errata
- source/Red Hat
- anchor-id/RHSA-2021:2666
- agent/software-canonical-lookup
- package-manager/redhat