RHSA-2020:5023 - Security Advisory

Topic

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

Security Fix(es):

• 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):

• [OSP13,mlx5] SRIOV VF still sending traffic when PF is down (BZ#1733181)
• gpf panic in virtio_check_driver_offered_fxature+6 when running sg_inq on a dm map for a lost virtio_blk (BZ#1811893)
• GPF panic in qlt_free_session_done+626 (BZ#1826127)
• [ Brazos ] "Core(s) per socket" and "Socket" values are interchanged in lscpu output. (kernel) (BZ#1826306)
• megaraid Aero: call trace observed during reboots (BZ#1828312)
• Crash in mptscsih_io_done() due to buffer overrun in sense_buf_pool (BZ#1829803)
• The qedf driver fails to re-establish the online F/C port state when the downstream F/C port is toggled unless a LIP is forced (BZ#1836443)
• tcp_fragment() limit causes packet drop under normal TCP load (BZ#1847765)
• ip link command shows state as UNKNOWN for MACVLAN interface (BZ#1848950)
• Lenovo TS 7Z60 Cooper Lake: PCI BAR firmware bug (BZ#1849223)
• [RHEL-7/mlx4] ipoib_flush ipoib_ib_dev_flush_light [ib_ipoib] (BZ#1858707)
• Uprobes crashes processes under GDB - SIGTRAP and SIGSEGV (BZ#1861396)
• kernel-3.10.0-1127.19.1.el7.x86_64 crashes after an SSH connection attempt when running as a Xen PV guest on AMD Epyc Rome (BZ#1882468)
• Null ptr deref after nf_reinject->nf_queue_entry_release_refs hits Attempt to release error doing inet_sock_destruct() (BZ#1885682)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs.

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 Server 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

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