RedHat: RHSA-2019-0833:01 Important: kernel-rt security and bug fix update
Summary
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: KVM: potential use-after-free via kvm_ioctl_create_device()
(CVE-2019-6974)
* Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the
preemption timer (CVE-2019-7221)
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):
* VM hangs on RHEL rt-kernel and OSP 13 [rhel-7.6.z] (BZ#1688673)
* kernel-rt: update to the RHEL7.6.z batch#4 source tree (BZ#1689417)
Users of kernel are advised to upgrade to these updated packages, which fix
these bugs.
Summary
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.
References
https://access.redhat.com/security/cve/CVE-2019-6974 https://access.redhat.com/security/cve/CVE-2019-7221 https://access.redhat.com/security/updates/classification/#important
Package List
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-957.12.1.rt56.927.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-957.12.1.rt56.927.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.12.1.rt56.927.el7.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/
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64
Bugs Fixed
1671904 - CVE-2019-7221 Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer
1671913 - CVE-2019-6974 Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
1688673 - VM hangs on RHEL rt-kernel and OSP 13 [rhel-7.6.z]
1689417 - kernel-rt: update to the RHEL7.6.z batch#4 source tree