Important: kernel security, bug fix, and enhancement update

Synopsis

Important: kernel security, bug fix, and enhancement 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: use-after-free in __blk_add_trace in kernel/trace/blktrace.c (CVE-2019-19768)
  
• Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711)
  
• Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation (CVE-2020-11884)
  

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):

• [FJ8.1 Bug]: A system panic occurs when an I/O timeout occurs. (BZ#1787296)
  
• [i40e]BUG: unable to handle kernel NULL pointer dereference at 0000000000000029 (BZ#1802483)
  
• [OSP16] [offload] [mellanox] VF representors of 2nd nic of bond is NOT renamed as _ (BZ#1802484)
  
• The kernel crashes in nbd_check_sock_type() due to stack corruption if the socket address family is AF_INET6. (BZ#1807605)
  
• Hung kernel tasks with LPm16004B-L when fabric paths are returning (BZ#1807831)
  
• bitops: protect variables in set_mask_bits() macro (kernel) (BZ#1809042)
  
• [RHEL8] blktests block/007 test failed (BZ#1812806)
  
• [RHEL8.2 Alpha] Server panics with NULL pointer dereference during boot in selinux_task_to_inode() (BZ#1812807)
  
• [RHEL8] Kernel panic on job cleanup, related to SyS_getdents64 (BZ#1812808)
  
• [HPE 8.2 Bug] kernel ignores NMI from ilo (BZ#1816830)
  
• [RHEL8.2][Azure]Commits to resolve high network latency (BZ#1817944)
  
• cpu.share scheduling performance issue (BZ#1819908)
  
• [RHEL8] Scheduler - backport asymetrical and misfit enhancements (BZ#1821370)
  
• RHEL8.0 - powerpc/powernv: Enhance opal message read interface (BZ#1822205)
  
• SCSI updates for 8.2 (BZ#1822252)
  

Enhancement(s):

• [RFE] Backport RCU dependecies for kernel-rt (rhel-rt-8.2.0) from stable (BZ#1826215)

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 - 1786164 - CVE-2019-19768 kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c
• BZ - 1825116 - CVE-2020-10711 Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic
• BZ - 1828149 - CVE-2020-11884 Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation

CVEs

• CVE-2019-19768
• CVE-2020-10711
• CVE-2020-11884

References

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