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Important RHSA-2019-2854-01: kpatch-patch Buffer Overflow on RHEL 7

red hat
Calendar Grey September 21, 2019
Dist Redhat Esm H88
Oracle enhances its Critical Patch Update for Solaris 11, focusing on resolving severe vulnerabilities and boosting system integrity.
An update for kpatch-patch is now available for Red Hat Enterprise Linux 7

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

Summary

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel.
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)
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.

Topics%20covered

Topics Covered

security advisory buffer overflow red hat important update kpatch-patch

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 Server (v. 7):
Source: kpatch-patch-3_10_0-1062-1-1.el7.src.rpm kpatch-patch-3_10_0-1062_1_1-1-1.el7.src.rpm
ppc64le: kpatch-patch-3_10_0-1062-1-1.el7.ppc64le.rpm kpatch-patch-3_10_0-1062-debuginfo-1-1.el7.ppc64le.rpm kpatch-patch-3_10_0-1062_1_1-1-1.el7.ppc64le.rpm kpatch-patch-3_10_0-1062_1_1-debuginfo-1-1.el7.ppc64le.rpm
x86_64: kpatch-patch-3_10_0-1062-1-1.el7.x86_64.rpm kpatch-patch-3_10_0-1062-debuginfo-1-1.el7.x86_64.rpm kpatch-patch-3_10_0-1062_1_1-1-1.el7.x86_64.rpm kpatch-patch-3_10_0-1062_1_1-debuginfo-1-1.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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2019:2854-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2854
Issue date: 2019-09-21

Topic

An update for kpatch-patch 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.

Topics%20covered

Topics Covered

security advisory buffer overflow red hat important update kpatch-patch

Relevant Releases Architectures

Red Hat Enterprise Linux Server (v. 7) - ppc64le, x86_64

Bugs Fixed

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

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