Important: kernel security and bug fix update

Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.1 Extended Update Support.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c (CVE-2020-25211)
  
• kernel: information exposure in drivers/char/random.c and kernel/time/timer.c (CVE-2020-16166)
  

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):

• RHEL8.1 - net/smc: fix silent data corruption in SMC (BZ#1882242)
  
• RHEL8.1 - Random memory corruption may occur due to incorrect tlbflush (BZ#1899210)
  
• RHEL8.3 Beta - RHEL8.3 hangs on dbginfo.sh execution, crash dump generated (mm-) (BZ#1903021)
  
• [Azure][RHEL8] IP forwarding issue in netvsc (BZ#1904327)

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 x86_64 - Extended Update Support 8.1 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.1 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.1 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.1 aarch64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 8.1 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 8.1 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.1 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.1 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.1 aarch64

Fixes

• BZ - 1865751 - CVE-2020-16166 kernel: information exposure in drivers/char/random.c and kernel/time/timer.c
• BZ - 1877571 - CVE-2020-25211 kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c

CVEs

• CVE-2020-16166
• CVE-2020-25211

References

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