RHSA-2022:1975 - Security Advisory

Topic

An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

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: 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)
• 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: 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 Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.8 x86_64
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.6 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.6 x86_64

Fixes

• BZ - 1901726 - CVE-2020-27820 kernel: use-after-free in nouveau kernel module
• BZ - 1903578 - kernnel-rt-debug: do not call blocking ops when !TASK_RUNNING; state=1 set at [<0000000050e86018>] handle_userfault+0x530/0x1820
• BZ - 1905749 - kernel-rt-debug: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:968
• 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 - 1974079 - CVE-2021-3612 kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP()
• 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 - 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 - 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 - 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 - 2016169 - CVE-2020-13974 kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c
• 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 - 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 - 2030747 - CVE-2021-44733 kernel: use-after-free in the TEE subsystem
• 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 - 2042822 - CVE-2022-0322 kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c
• 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-2020-13974
• 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-2021-3923
• CVE-2021-4002
• CVE-2021-4037
• CVE-2021-4083
• CVE-2021-4093
• CVE-2021-4157
• CVE-2021-4197
• CVE-2021-4203
• CVE-2021-20322
• CVE-2021-26401
• CVE-2021-29154
• CVE-2021-37159
• CVE-2021-41864
• CVE-2021-42739
• 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-2022-0850
• CVE-2022-1011
• CVE-2022-3105
• CVE-2022-3106
• CVE-2022-3108
• CVE-2023-3022

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/