Important: kernel security, bug fix, and enhancement update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.

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.

The following packages have been upgraded to a later upstream version: kernel (4.18.0). (BZ#2036888)

Security Fix(es):

• kernel: improper initialization of the "flags" member of the new pipe_buffer (CVE-2022-0847)
• kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
• kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout (CVE-2021-4154)
• kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
• kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)
• kernel: cgroups v1 release_agent feature may allow privilege escalation (CVE-2022-0492)
• kernel: missing check in ioctl allows kernel memory read/write (CVE-2022-0516)
• kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)

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):

• Intel QAT Kernel power up fix (BZ#2016437)
• RHEL8.4 seeing scsi_dma_map failed with mpt3sas driver and affecting performance (BZ#2018928)
• [Lenovo 8.4 bug] audio_HDMI certification failed on RHEL 8.4GA (No hdmi out) (BZ#2027335)
• [RHEL-8.5][4.18.0-323.el8.ppc64le][POWER8/9/10] security_flavor mode is not set back to zero post online migration (BZ#2027448)
• iommu/amd: Fix unable to handle page fault due to AVIC (BZ#2030854)
• [Lenovo 8.4 bug]The VGA display shows no signal (black screen) when install RHEL8.4(beta or rc1) in the legacy BIOS mode. (BZ#2034949)
• Double free of kmalloc-64 cache struct ib_port->pkey_group from module ib_core . (BZ#2038724)
• Bus error with huge pages enabled (BZ#2039015)
• RHEL8 - kvm: floating interrupts may get stuck (BZ#2040769)
• Data corruption on small files served by httpd, which is backed by cifs-mount (BZ#2041529)
• Add a net/mlx5 patch for Hardware Offload Fix (BZ#2042663)
• Windows guest random Bsod when 'hv-tlbflush' enlightenment is enabled (BZ#2043237)
• DNS lookup failures when run two times in a row (BZ#2043548)
• net/sched: Fix ct zone matching for invalid conntrack state (BZ#2043550)
• Kernel 4.18.0-348.2.1 secpath_cache memory leak involving strongswan tunnel (BZ#2047427)
• OCP node XFS metadata corruption after numerous reboots (BZ#2049292)
• Broadcom bnxt_re: RDMA stats are not incrementing (BZ#2049684)
• ice: bug fix series for 8.6 (BZ#2051951)
• panic while looking up a symlink due to NULL i_op->get_link (BZ#2052558)
• ceph omnibus backport for RHEL-8.6.0 (BZ#2053725)
• SCTP peel-off with SELinux and containers in OCP (BZ#2054112)
• Selinux is not allowing SCTP connection setup between inter pod communication in enforcing mode (BZ#2054117)
• dnf fails with fsync() over local repository present on CIFS mount point (BZ#2055824)

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 Virtualization Host 4 for RHEL 8 x86_64
• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64

Fixes

• BZ - 2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation
• BZ - 2034514 - CVE-2021-4154 kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout
• BZ - 2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush
• BZ - 2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation
• BZ - 2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS
• BZ - 2050237 - CVE-2022-0516 kernel: missing check in ioctl allows kernel memory read/write
• BZ - 2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation
• BZ - 2060795 - CVE-2022-0847 kernel: improper initialization of the "flags" member of the new pipe_buffer

CVEs

• CVE-2021-0920
• CVE-2021-4154
• CVE-2022-0330
• CVE-2022-0435
• CVE-2022-0492
• CVE-2022-0516
• CVE-2022-0847
• CVE-2022-22942

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/RHSB-2022-002