RHSA-2019:4256: Important: kernel security and bug fix update
First published: Tue Dec 17 2019(Updated: )
The kernel packages contain the Linux kernel, the core of any Linux operating system.<br>Security Fix(es):<br><li> Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)</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> KEYS: prevent creating a different user's keyrings RHEL-6.10 (BZ#1537371)</li> <li> BUG: unable to handle kernel NULL pointer dereference at (null) (BZ#1733760)</li> <li> long I/O stalls with bnx2fc from not masking off scope bits of retry delay value (BZ#1749512)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-abi-whitelists | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug-devel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug-devel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debuginfo-common-i686 | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-devel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-doc | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-firmware | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-headers | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/perf | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/perf-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/perf-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/python-perf | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/python-perf-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/python-perf-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debug | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-devel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-headers | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/perf | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/python-perf | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debuginfo-common-s390x | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-kdump | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-kdump-debuginfo | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-kdump-devel | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-bootwrapper | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
| redhat/kernel-debuginfo-common-ppc64 | <2.6.32-754.25.1.el6 | 2.6.32-754.25.1.el6 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2019:4256?
The severity of RHSA-2019:4256 is classified as important due to the potential for out-of-bounds memory access risks.
How do I fix RHSA-2019:4256?
To fix RHSA-2019:4256, users should update their kernel packages to version 2.6.32-754.25.1.el6 or later.
What issue does RHSA-2019:4256 address?
RHSA-2019:4256 addresses an out-of-bounds memory access vulnerability in the KVM component of the Linux kernel.
What are the affected systems for RHSA-2019:4256?
RHSA-2019:4256 affects Red Hat Enterprise Linux 6 systems running specific versions of the kernel and related packages.
Is a reboot required after fixing RHSA-2019:4256?
Yes, a reboot is typically required after updating the kernel to ensure that the new version is loaded into memory.
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