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

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):

• BUG: scheduling while atomic: memory allocation under spinlock in scsi_register_device_handler() (BZ#1619147)
• WARNING in __iscsit_free_cmd during recovery Abort (BZ#1784540)
• lpfc does not issue adisc to fcp-2 devices, does not respond to nvme targer that send an adisc. (BZ#1875961)
• Panic in semctl_nolock.constprop.15+0x25b (BZ#1877264)
• [RHEL 7.7][md]Crash due to invalid pool workqueue pointer, work queue race (BZ#1889372)
• Guest crash on intel CPU with -cpu host,-spec-ctrl,+ibpb (BZ#1890669)
• RHEL7.9 - kernel/uv: handle length extension properly (BZ#1899172)
• Commit b144f013fc16a06d7a4b9a4be668a3583fafeda2 'i40e: don't report link up for a VF who hasn't enabled queues' introducing issues with VM using DPDK (BZ#1901064)
• writing to /sys/devices/(...)/net/eno49/queues/tx-16/xps_cpus triggers kernel panic (BZ#1903819)
• [Hyper-V][RHEL-7.9]video: hyperv_fb: Fix the cache type when mapping the VRAM Edit (BZ#1908896)
• kvm-rhel7.9 [AMD] - system crash observed while powering on virtual machine with attached VF interfaces. (BZ#1909036)
• kernel: nvme nvme7: Connect command failed, error wo/DNR bit: 2 (BZ#1910817)
• dm-mirror crashes from assuming underlying storage will have a non-NULL merge_bvec_fn (BZ#1916407)
• watchdog: use nmi registers snapshot in hardlockup handler (BZ#1916589)
• [DELL EMC 7.9 BUG] - Intel E810 NIC interfaces are not functional in RHEL 7.9 on system with AMD Rome CPUs (BZ#1918273)
• [DELL EMC BUG] RHEL system log shows AMD-Vi error when system connected with Gen 4 NVMe drives. (BZ#1921187)

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 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 Virtualization Host 4 for RHEL 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 - 1901064 - Commit b144f013fc16a06d7a4b9a4be668a3583fafeda2 'i40e: don't report link up for a VF who hasn't enabled queues' introducing issues with VM using DPDK
• 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 - 1916589 - watchdog: use nmi registers snapshot in hardlockup handler
• 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