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Red Hat Enterprise Linux 8 RHSA-2019-2828-01 Important Buffer Overflow

red hat
Calendar Grey September 20, 2019
Dist Redhat Esm H88
Critical patch for kernel-rt released for Red Hat Enterprise Linux 8. This update addresses a significant buffer overflow vulnerability.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8

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.

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):
* A buffer overflow flaw was found in the way Linux kernel's vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. (CVE-2019-14835)

Topics%20covered

Topics Covered

security advisory buffer overflow red hat security fix important kernel-rt real time

References

https://access.redhat.com/security/cve/CVE-2019-14835 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/kernel-vhost

Package List

Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source: kernel-rt-4.18.0-80.11.2.rt9.157.el8_0.src.rpm
x86_64: kernel-rt-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-core-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-core-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-devel-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-kvm-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-kvm-debuginfo-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-modules-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debuginfo-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-devel-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-kvm-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-kvm-debuginfo-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-modules-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm kernel-rt-modules-extra-4.18.0-80.11.2.rt9.157.el8_0.x86_64.rpm
Red Hat Enterprise Linux Real Time (v. 8):
Source: kernel-rt-4.18.0-80.11.2.rt9.157.el8_0.src.rpm
x86_64:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2019:2828-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2828
Issue date: 2019-09-20

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.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.

Topics%20covered

Topics Covered

security advisory buffer overflow red hat security fix important kernel-rt real time

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time (v. 8) - x86_64

Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64

Bugs Fixed

1750727 - CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration

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