Synopsis

Important: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.

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: bad kfree in auditfilter.c may lead to escalation of privilege (CVE-2020-0444)
• kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c (CVE-2020-25211)
• kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
• kernel: performance counters race condition use-after-free (CVE-2020-14351)
• kernel: ICMP rate limiting can be used for DNS poisoning attack (CVE-2020-25705)

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):

• RHEL8.1 - net/smc: fix silent data corruption in SMC (BZ#1882241)
• [mlx5] VF interface stats are not reflected in "ip -s link show" / "ifconfig " commands (BZ#1889301)
• [mlx5] IPV6 TOS rewrite flows are not getting offloaded in HW (BZ#1897689)
• RHEL 8.1 - Call traces show I/O stuck for more than 120 sec when at least one path is available for NVMe/IB (BZ#1901525)
• RHEL8: kernel-rt: kernel BUG at kernel/sched/deadline.c:1462! (BZ#1908732)
• [Hyper-V][RHEL-8] Request to included a commit that adds a timeout to vmbus_wait_for_unload (BZ#1913529)
• Host becomes unresponsive during stress-ng --cyclic test rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (BZ#1913965)
• race condition when creating child sockets from syncookies (BZ#1915530)
• Missing mm backport to fix regression introduced by another mm backport (BZ#1915815)
• On System Z, a hash needs state randomized for entropy extraction (BZ#1915817)
• [Hyper-V][RHEL-8]video: hyperv_fb: Fix the cache type when mapping the VRAM Edit (BZ#1917712)
• kvm-rhel8.3 [AMD] - system crash observed while powering on virtual machine with attached VF interfaces. (BZ#1919886)
• [CKI kernel builds]: x86 binaries in non-x86 kernel rpms breaks systemtap (BZ#1929909)
• rpmbuild cannot build the userspace RPMs in the kernel package when the kernel itself is not built (BZ#1929911)

Enhancement(s):

• [Mellanox 8.4 FEAT] mlx5: Add messages when VF-LAG fails to start (BZ#1892345)
• Add kernel option to change cpumask for kernel threads (BZ#1915344)

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 x86_64 - Extended Update Support 8.2 x86_64
• Red Hat Enterprise Linux Server - AUS 8.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.2 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.2 aarch64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 8.2 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 8.2 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.2 aarch64

Fixes

• 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 - 1894579 - CVE-2020-25705 kernel: ICMP rate limiting can be used for DNS poisoning attack
• BZ - 1906525 - CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free
• BZ - 1920474 - CVE-2020-0444 kernel: bad kfree in auditfilter.c may lead to escalation of privilege

CVEs

• CVE-2020-0444
• CVE-2020-14351
• CVE-2020-25211
• CVE-2020-25705
• CVE-2020-29661

References