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.

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: net: bluetooth: type confusion while processing AMP packets (CVE-2020-12351)
  
• kernel: net: bluetooth: information leak when processing certain AMP packets (CVE-2020-12352)
  
• kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt (CVE-2020-14385)
  
• kernel: memory corruption in net/packet/af_packet.c leads to elevation of privilege (CVE-2020-14386)
  
• kernel: kernel: buffer over write in vgacon_scroll (CVE-2020-14331)
  

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):

• [mlx5] stale ethtool steering rules remain after moving back to legacy mode (BZ#1857777)
  
• 50% cpu in masked_flow_update with pop to pod TCP_RR (BZ#1859216)
  
• take into account GSO and fragmented packets in execute_check_pkt_len action (BZ#1860169)
  
• RHEL8.1 - scsi: ibmvfc: Avoid loss of all paths during SVC node reboot (BZ#1866371)
  
• RHEL8.3 Pre-Beta - smc: SMC connections hang with later-level implementations (BZ#1866390)
  
• Incorrect pinning of IRQ threads on isolated CPUs by drivers that use cpumask_local_spread() (BZ#1867174)
  
• [RHEL8] Fixes for DEADLINE scheduler class (BZ#1867612)
  
• RHEL8.1 - s390/pci: Fix unexpected write combine on resource (BZ#1869276)
  
• dm multipath: fix spurious failures during IO completion [EIOP-8345] (BZ#1869386)
  
• IO on virtio-scsi hangs when running cpu hotplug test (BZ#1869779)
  
• store_rps_map doesn't accept an empty bitmask, which is required for disabling RPS on a queue (BZ#1870181)
  
• Memory registration cache data corruption possible, fix requires backporting (BZ#1872424)
  
• fix another case of wait list corruption for PSM/sdma (BZ#1872766)
  
• [RHEL-8] Segmentation fault (core dumped) when fi_bw -e msg -v -T 1 -p "verbs" (BZ#1872771)
  
• fix mounting and inode number handling on s390x (BZ#1875787)
  
• failure to enter nohz_full mode for non SCHED_FIFO tasks (BZ#1877417)
  
• Secure boot key is not loaded with kernel-4.18.0-232.el8.x86_64 / shim-x64-15-15 (BZ#1877528)
  
• [RHEL-8.3] Kdump failed to start when secure boot enabled: kexec_file_load failed: Required key not available (BZ#1877530)
  
• [RHEL-8.3] Kdump/kexec kernel panicked on EFI boot: general protection fault: 0000 [#1] SMP PTI (BZ#1879988)
  
• Sleeping or scheduling after sched_cpu_dying() led to "scheduling while atomic" and BUG at kernel/cpu.c:907! (BZ#1880081)
  
• [conntrack] udp packet reverse NAT occasionally fail when race condition request combination with the DNAT load balancing rules (BZ#1882095)
  
• [Regression] RHEL8.3 Beta - Do not initiate shutdown for EPOW_SHUTDOWN_ON_UPS event (BZ#1882243)

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 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat Enterprise Linux Server - AUS 8.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.2 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.2 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.2 aarch64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 8.2 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 8.2 x86_64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.2 aarch64

Fixes

• BZ - 1858679 - CVE-2020-14331 kernel: kernel: buffer over write in vgacon_scroll
• BZ - 1874800 - CVE-2020-14385 kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt
• BZ - 1875699 - CVE-2020-14386 kernel: memory corruption in net/packet/af_packet.c leads to elevation of privilege
• BZ - 1886521 - CVE-2020-12351 kernel: net: bluetooth: type confusion while processing AMP packets
• BZ - 1886529 - CVE-2020-12352 kernel: net: bluetooth: information leak when processing certain AMP packets

CVEs

• CVE-2020-12351
• CVE-2020-12352
• CVE-2020-14331
• CVE-2020-14385
• CVE-2020-14386

References

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