RHSA-2020:3016: Important: kernel-rt security and bug fix update
First published: Tue Jul 21 2020(Updated: )
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.<br>Security Fix(es):<br><li> kernel: use-after-free in sound/core/timer.c (CVE-2019-19807)</li> <li> kernel: kernel: DAX hugepages not considered during mremap (CVE-2020-10757)</li> <li> kernel: Rogue cross-process SSBD shutdown. Linux scheduler logical bug allows an attacker to turn off the SSBD protection. (CVE-2020-10766)</li> <li> kernel: Indirect Branch Prediction Barrier is force-disabled when STIBP is unavailable or enhanced IBRS is available. (CVE-2020-10767)</li> <li> kernel: Indirect branch speculation can be enabled after it was force-disabled by the PR_SPEC_FORCE_DISABLE prctl command. (CVE-2020-10768)</li> <li> kernel: buffer overflow in mwifiex_cmd_append_vsie_tlv function in drivers/net/wireless/marvell/mwifiex/scan.c (CVE-2020-12653)</li> <li> kernel: heap-based buffer overflow in mwifiex_ret_wmm_get_status function in drivers/net/wireless/marvell/mwifiex/wmm.c (CVE-2020-12654)</li> <li> Kernel: vfio: access to disabled MMIO space of some devices may lead to DoS scenario (CVE-2020-12888)</li> <li> kernel: kvm: Information leak within a KVM guest (CVE-2019-3016)</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> kernel-rt: update RT source tree to the RHEL-8.2.z2 source tree (BZ#1829582)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-core | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-core | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-debuginfo | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-devel | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-modules | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-modules-extra | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debuginfo | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-devel | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-modules | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-modules-extra | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-debug-kvm | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel-rt-kvm | <4.18.0-193.13.2.rt13.65.el8_2 | 4.18.0-193.13.2.rt13.65.el8_2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1786078
- https://bugzilla.redhat.com/show_bug.cgi?id=1792167
- https://bugzilla.redhat.com/show_bug.cgi?id=1831868
- https://bugzilla.redhat.com/show_bug.cgi?id=1832530
- https://bugzilla.redhat.com/show_bug.cgi?id=1836244
- https://bugzilla.redhat.com/show_bug.cgi?id=1842525
- https://bugzilla.redhat.com/show_bug.cgi?id=1845840
- https://bugzilla.redhat.com/show_bug.cgi?id=1845867
- https://bugzilla.redhat.com/show_bug.cgi?id=1845868
- https://access.redhat.com/security/updates/classification/#important
- https://access.redhat.com/errata/RHSA-2020:3016 (Advisory)
Frequently Asked Questions
What is the severity of RHSA-2020:3016?
RHSA-2020:3016 addresses vulnerabilities with a significant security impact due to a use-after-free flaw in the Real Time Linux kernel.
How do I fix RHSA-2020:3016?
To fix RHSA-2020:3016, update your kernel-rt packages to version 4.18.0-193.13.2.rt13.65.el8_2 or later.
Which packages are affected by RHSA-2020:3016?
RHSA-2020:3016 affects several kernel-rt packages including kernel-rt, kernel-rt-core, and other related debug and development packages.
What does the use-after-free vulnerability in RHSA-2020:3016 allow for?
The use-after-free vulnerability in RHSA-2020:3016 can potentially allow an attacker to execute arbitrary code with elevated privileges.
Is it safe to continue using systems without addressing RHSA-2020:3016?
Continuing to use systems without addressing RHSA-2020:3016 poses a risk of exploitation, and it is advisable to apply the necessary updates promptly.
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