RHSA-2019:3978 - Security Advisory

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 impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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: OOB memory access via mmio ring buffer (CVE-2019-14821)
• kernel: local attacker can trigger multiple use-after-free conditions results in privilege escalation (CVE-2019-15239)

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):

• kernel-rt: update to the RHEL7.7.z batch#3 source tree (BZ#1762889)

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.

Affected Products

• Red Hat Enterprise Linux for Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64
• Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 1746708 - CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer
• BZ - 1747353 - CVE-2019-15239 kernel: local attacker can trigger multiple use-after-free conditions results in privilege escalation
• BZ - 1762889 - kernel-rt: update to the RHEL7.7.z batch#3 source tree

CVEs

• CVE-2019-14821
• CVE-2019-15239

References

• https://access.redhat.com/security/updates/classification/#important