RHSA-2021:0857 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

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-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)

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 Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

• BZ - 1781821 - CVE-2019-19532 kernel: malicious USB devices can lead to multiple out-of-bounds write
• BZ - 1795624 - CVE-2020-7053 kernel: use-after-free in i915_ppgtt_close in drivers/gpu/drm/i915/i915_gem_gtt.c
• BZ - 1862849 - CVE-2020-14351 kernel: performance counters race condition use-after-free
• BZ - 1877571 - CVE-2020-25211 kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c
• BZ - 1883988 - CVE-2020-25645 kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints
• BZ - 1888726 - CVE-2020-25656 kernel: use-after-free in read in vt_do_kdgkb_ioctl
• BZ - 1894579 - CVE-2020-25705 kernel: ICMP rate limiting can be used for DNS poisoning attack
• BZ - 1899804 - CVE-2020-28374 kernel: SCSI target (LIO) write to any block on ILO backstore
• BZ - 1906525 - CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free
• BZ - 1908827 - CVE-2021-20265 kernel: increase slab leak leads to DoS
• BZ - 1919893 - CVE-2020-0427 kernel: out-of-bounds reads in pinctrl subsystem.

CVEs

• CVE-2019-19532
• CVE-2020-0427
• CVE-2020-7053
• CVE-2020-14351
• CVE-2020-25211
• CVE-2020-25645
• CVE-2020-25656
• CVE-2020-25705
• CVE-2020-28374
• CVE-2020-29661
• CVE-2021-20265

References

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