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.

Security Fix(es):

• kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)
• kernel: avoid cyclic entity chains due to malformed USB descriptors (CVE-2020-0404)
• kernel: speculation on incompletely validated data on IBM Power9 (CVE-2020-4788)
• kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c (CVE-2020-13974)
• kernel: out-of-bounds read in bpf_skb_change_head() of filter.c due to a use-after-free (CVE-2021-0941)
• kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP() (CVE-2021-3612)
• kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts (CVE-2021-3669)
• kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c (CVE-2021-3743)
• kernel: crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd() (CVE-2021-3744)
• kernel: possible use-after-free in bluetooth module (CVE-2021-3752)
• kernel: unaccounted ipc objects in Linux kernel lead to breaking memcg limits and DoS attacks (CVE-2021-3759)
• kernel: DoS in ccp_run_aes_gcm_cmd() function (CVE-2021-3764)
• kernel: sctp: Invalid chunks may be used to remotely remove existing associations (CVE-2021-3772)
• kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients (CVE-2021-3773)
• kernel: possible leak or coruption of data residing on hugetlbfs (CVE-2021-4002)
• kernel: security regression for CVE-2018-13405 (CVE-2021-4037)
• kernel: Buffer overwrite in decode_nfs_fh function (CVE-2021-4157)
• kernel: cgroup: Use open-time creds and namespace for migration perm checks (CVE-2021-4197)
• kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses (CVE-2021-4203)
• kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (CVE-2021-20322)
• kernel: arm: SIGPAGE information disclosure vulnerability (CVE-2021-21781)
• hw: cpu: LFENCE/JMP Mitigation Update for CVE-2017-5715 (CVE-2021-26401)
• kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)
• kernel: use-after-free in hso_free_net_device() in drivers/net/usb/hso.c (CVE-2021-37159)
• kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write (CVE-2021-41864)
• kernel: Heap buffer overflow in firedtv driver (CVE-2021-42739)
• kernel: ppc: kvm: allows a malicious KVM guest to crash the host (CVE-2021-43056)
• kernel: an array-index-out-bounds in detach_capi_ctr in drivers/isdn/capi/kcapi.c (CVE-2021-43389)
• kernel: mwifiex_usb_recv() in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker to cause DoS via crafted USB device (CVE-2021-43976)
• kernel: use-after-free in the TEE subsystem (CVE-2021-44733)
• kernel: information leak in the IPv6 implementation (CVE-2021-45485)
• kernel: information leak in the IPv4 implementation (CVE-2021-45486)
• hw: cpu: intel: Branch History Injection (BHI) (CVE-2022-0001)
• hw: cpu: intel: Intra-Mode BTI (CVE-2022-0002)
• kernel: Local denial of service in bond_ipsec_add_sa (CVE-2022-0286)
• kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c (CVE-2022-0322)
• kernel: FUSE allows UAF reads of write() buffers, allowing theft of (partial) /etc/shadow hashes (CVE-2022-1011)
• kernel: use-after-free in nouveau kernel module (CVE-2020-27820)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes linked from the References section.

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 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Virtualization Host 4 for RHEL 8 x86_64
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions 8.6 x86_64
• 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
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.6 aarch64

Fixes

• BZ - 1888433 - CVE-2020-4788 kernel: speculation on incompletely validated data on IBM Power9
• BZ - 1901726 - CVE-2020-27820 kernel: use-after-free in nouveau kernel module
• BZ - 1919791 - CVE-2020-0404 kernel: avoid cyclic entity chains due to malformed USB descriptors
• BZ - 1946684 - CVE-2021-29154 kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation
• BZ - 1951739 - CVE-2021-42739 kernel: Heap buffer overflow in firedtv driver
• BZ - 1957375 - [RFE] x86, tsc: Add kcmdline args for skipping tsc calibration sequences
• BZ - 1974079 - CVE-2021-3612 kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP()
• BZ - 1981950 - CVE-2021-21781 kernel: arm: SIGPAGE information disclosure vulnerability
• BZ - 1983894 - Hostnetwork pod to service backed by hostnetwork on the same node is not working with OVN Kubernetes
• BZ - 1985353 - CVE-2021-37159 kernel: use-after-free in hso_free_net_device() in drivers/net/usb/hso.c
• BZ - 1986473 - CVE-2021-3669 kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts
• BZ - 1994390 - FIPS: deadlock between PID 1 and "modprobe crypto-jitterentropy_rng" at boot, preventing system to boot
• BZ - 1997338 - block: update to upstream v5.14
• BZ - 1997467 - CVE-2021-3764 kernel: DoS in ccp_run_aes_gcm_cmd() function
• BZ - 1997961 - CVE-2021-3743 kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c
• BZ - 1999544 - CVE-2021-3752 kernel: possible use-after-free in bluetooth module
• BZ - 1999675 - CVE-2021-3759 kernel: unaccounted ipc objects in Linux kernel lead to breaking memcg limits and DoS attacks
• BZ - 2000627 - CVE-2021-3744 kernel: crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd()
• BZ - 2000694 - CVE-2021-3772 kernel: sctp: Invalid chunks may be used to remotely remove existing associations
• BZ - 2004949 - CVE-2021-3773 kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients
• BZ - 2009312 - Incorrect system time reported by the cpu guest statistics (PPC only).
• BZ - 2009521 - XFS: sync to upstream v5.11
• BZ - 2010463 - CVE-2021-41864 kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write
• BZ - 2011104 - statfs reports wrong free space for small quotas
• BZ - 2013180 - CVE-2021-43389 kernel: an array-index-out-bounds in detach_capi_ctr in drivers/isdn/capi/kcapi.c
• BZ - 2014230 - CVE-2021-20322 kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies
• BZ - 2015525 - SCTP peel-off with SELinux and containers in OCP
• BZ - 2015755 - zram: zram leak with warning when running zram02.sh in ltp
• BZ - 2016169 - CVE-2020-13974 kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c
• BZ - 2017073 - CVE-2021-43056 kernel: ppc: kvm: allows a malicious KVM guest to crash the host
• BZ - 2017796 - ceph omnibus backport for RHEL-8.6.0
• BZ - 2018205 - CVE-2021-0941 kernel: out-of-bounds read in bpf_skb_change_head() of filter.c due to a use-after-free
• BZ - 2022814 - Rebase the input and HID stack in 8.6 to v5.15
• BZ - 2025003 - CVE-2021-43976 kernel: mwifiex_usb_recv() in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker to cause DoS via crafted USB device
• BZ - 2025726 - CVE-2021-4002 kernel: possible leak or coruption of data residing on hugetlbfs
• BZ - 2027239 - CVE-2021-4037 kernel: security regression for CVE-2018-13405
• BZ - 2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it
• BZ - 2030476 - Kernel 4.18.0-348.2.1 secpath_cache memory leak involving strongswan tunnel
• BZ - 2030747 - CVE-2021-44733 kernel: use-after-free in the TEE subsystem
• BZ - 2031200 - rename(2) fails on subfolder mounts when the share path has a trailing slash
• BZ - 2034342 - CVE-2021-4157 kernel: Buffer overwrite in decode_nfs_fh function
• BZ - 2035652 - CVE-2021-4197 kernel: cgroup: Use open-time creds and namespace for migration perm checks
• BZ - 2036934 - CVE-2021-4203 kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses
• BZ - 2037019 - CVE-2022-0286 kernel: Local denial of service in bond_ipsec_add_sa
• BZ - 2039911 - CVE-2021-45485 kernel: information leak in the IPv6 implementation
• BZ - 2039914 - CVE-2021-45486 kernel: information leak in the IPv4 implementation
• BZ - 2042798 - [RHEL8.6][sfc] General sfc driver update
• BZ - 2042822 - CVE-2022-0322 kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c
• BZ - 2043453 - [RHEL8.6 wireless] stack & drivers general update to v5.16+
• BZ - 2046021 - kernel 4.18.0-358.el8 async dirops causes write errors with namespace restricted caps
• BZ - 2048251 - Selinux is not allowing SCTP connection setup between inter pod communication in enforcing mode
• BZ - 2061700 - CVE-2021-26401 hw: cpu: LFENCE/JMP Mitigation Update for CVE-2017-5715
• BZ - 2061712 - CVE-2022-0001 hw: cpu: intel: Branch History Injection (BHI)
• BZ - 2061721 - CVE-2022-0002 hw: cpu: intel: Intra-Mode BTI
• BZ - 2064855 - CVE-2022-1011 kernel: FUSE allows UAF reads of write() buffers, allowing theft of (partial) /etc/shadow hashes

CVEs

• CVE-2020-0404
• CVE-2020-4788
• CVE-2020-13974
• CVE-2020-27820
• CVE-2021-0941
• CVE-2021-3612
• CVE-2021-3669
• CVE-2021-3743
• CVE-2021-3744
• CVE-2021-3752
• CVE-2021-3759
• CVE-2021-3764
• CVE-2021-3772
• CVE-2021-3773
• CVE-2021-4002
• CVE-2021-4037
• CVE-2021-4083
• CVE-2021-4157
• CVE-2021-4197
• CVE-2021-4203
• CVE-2021-20322
• CVE-2021-21781
• CVE-2021-26401
• CVE-2021-29154
• CVE-2021-37159
• CVE-2021-41864
• CVE-2021-42739
• CVE-2021-43056
• CVE-2021-43389
• CVE-2021-43976
• CVE-2021-44733
• CVE-2021-45485
• CVE-2021-45486
• CVE-2022-0001
• CVE-2022-0002
• CVE-2022-0286
• CVE-2022-0322
• CVE-2022-1011

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/