RHSA-2021:0019 — Security Advisory

Red Hat Security Advisory: kernel security and bug fix update

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Severity

Moderate

Red Hat Product Security

RHEL 7

Products

Official CSAF product identity

Published · January 6, 2021

Updated · June 28, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.7 Extended Update Support.

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: race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c leads to use-after-free (CVE-2018-20836)
kernel: use-after-free in drivers/bluetooth/hci_ldisc.c (CVE-2019-15917)
kernel: out-of-bounds write via crafted keycode table (CVE-2019-20636)

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):

RHEL7 - [ Brazos ] "Core(s) per socket" and "Socket" values are interchanged in lscpu output. (kernel) (BZ#1879096)
[DELL EMC 7.9 BUG] System crash when stressed using burnin stress tool (BZ#1893994)
[ Marvell 7.9] update qla2xxx driver with critical bug fixes (BZ#1895440)