[RHSA-2021:0857] kernel-rt security and bug fix update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c (CVE-2020-25211)

• kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)

• kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)

• kernel: malicious USB devices can lead to multiple out-of-bounds write (CVE-2019-19532)

• kernel: out-of-bounds reads in pinctrl subsystem. (CVE-2020-0427)

• kernel: use-after-free in i915_ppgtt_close in drivers/gpu/drm/i915/i915_gem_gtt.c (CVE-2020-7053)

• kernel: performance counters race condition use-after-free (CVE-2020-14351)

• kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints (CVE-2020-25645)

• kernel: use-after-free in read in vt_do_kdgkb_ioctl (CVE-2020-25656)

• kernel: ICMP rate limiting can be used for DNS poisoning attack (CVE-2020-25705)

• kernel: increase slab leak leads to DoS (CVE-2021-20265)

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):

• kernel-rt: update to the latest RHEL7.9.z4 source tree (BZ#1917909)