Moderate: kernel-rt security and bug fix update

Synopsis

Moderate: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Moderate

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 Moderate. 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: kernel: buffer over write in vgacon_scroll (CVE-2020-14331)
  
• kernel: net-sysfs: *_queue_add_kobject refcount issue (CVE-2019-20811)
  

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):

• [RHEL-7.9] net/ipv6/ip6_flowlabel.c:85 suspicious rcu_dereference_check() usage! (kernel-rt-debug) (BZ#1836846)
  
• md/raid: sleeping function called from invalid context triggered by CKI storage/swraid/trim test (BZ#1857872)
  
• Infinite looping when trying to acquire eventpoll->mtx during eventpoll_release_file, 2nd try (BZ#1877695)
  
• kernel-rt: update to the latest RHEL7.9.z1 source tree (BZ#1883995)

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

Fixes

• BZ - 1846439 - CVE-2019-20811 kernel: net-sysfs: *_queue_add_kobject refcount issue
• BZ - 1858679 - CVE-2020-14331 kernel: kernel: buffer over write in vgacon_scroll

CVEs

• CVE-2019-20811
• CVE-2020-14331

References

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