RHSA-2021:4140 - 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 Moderate. 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: out-of-bounds reads in pinctrl subsystem. (CVE-2020-0427)
• kernel: Improper input validation in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24502)
• kernel: Insufficient access control in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24503)
• kernel: Uncontrolled resource consumption in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24504)
• kernel: Fragmentation cache not cleared on reconnection (CVE-2020-24586)
• kernel: Reassembling fragments encrypted under different keys (CVE-2020-24587)
• kernel: wifi frame payload being parsed incorrectly as an L2 frame (CVE-2020-24588)
• kernel: Forwarding EAPOL from unauthenticated wifi client (CVE-2020-26139)
• kernel: accepting plaintext data frames in protected networks (CVE-2020-26140)
• kernel: not verifying TKIP MIC of fragmented frames (CVE-2020-26141)
• kernel: accepting fragmented plaintext frames in protected networks (CVE-2020-26143)
• kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header (CVE-2020-26144)
• kernel: accepting plaintext broadcast fragments as full frames (CVE-2020-26145)
• kernel: locking inconsistency in tty_io.c and tty_jobctrl.c can lead to a read-after-free (CVE-2020-29660)
• kernel: buffer overflow in mwifiex_cmd_802_11_ad_hoc_start function via a long SSID value (CVE-2020-36158)
• kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt() (CVE-2020-36386)
• kernel: Improper access control in BlueZ may allow information disclosure vulnerability. (CVE-2021-0129)
• kernel: Use-after-free in ndb_queue_rq() (CVE-2021-3348)
• kernel: Linux kernel eBPF RINGBUF map oversized allocation (CVE-2021-3489)
• kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564)
• kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)
• kernel: eBPF 32-bit source register truncation on div/mod (CVE-2021-3600)
• kernel: DoS in rb_per_cpu_empty() (CVE-2021-3679)
• kernel: overlayfs: Mounting overlayfs inside an unprivileged user namespace can reveal files (CVE-2021-3732)
• kernel: heap overflow in __cgroup_bpf_run_filter_getsockopt() (CVE-2021-20194)
• kernel: Race condition in sctp_destroy_sock list_del (CVE-2021-23133)
• kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode (CVE-2021-28950)
• kernel: System crash in intel_pmu_drain_pebs_nhm (CVE-2021-28971)
• kernel: protection for sequences of pointer arithmetic operations against speculatively out-of-bounds loads can be bypassed to leak content of kernel memory (CVE-2021-29155)
• kernel: improper input validation in tipc_nl_retrieve_key function (CVE-2021-29646)
• kernel: lack a full memory barrier upon the assignment of a new table value in x_tables.h may lead to DoS (CVE-2021-29650)
• kernel: local escalation of privileges in handling of eBPF programs (CVE-2021-31440)
• kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory (CVE-2021-31829)
• kernel: out-of-bounds reads and writes due to enforcing incorrect limits for pointer arithmetic operations by BPF verifier (CVE-2021-33200)
• kernel: reassembling encrypted fragments with non-consecutive packet numbers (CVE-2020-26146)
• kernel: reassembling mixed encrypted/plaintext fragments (CVE-2020-26147)
• kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check (CVE-2020-29368)
• kernel: flowtable list del corruption with kernel BUG (CVE-2021-3635)
• kernel: NULL pointer dereference in llsec_key_alloc() (CVE-2021-3659)
• kernel: setsockopt System Call Untrusted Pointer Dereference Information Disclosure (CVE-2021-20239)
• kernel: out of bounds array access in drivers/md/dm-ioctl.c (CVE-2021-31916)

Solution

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 8.5 Release Notes linked from the References section.

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 8.6 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.6 x86_64

Fixes

• BZ - 1875275 - Failure to enter full_nohz due to needless SCHED softirqs
• BZ - 1902412 - [kernel-rt] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u129:3/1367837 observed with blktests nvme-tcp tests
• BZ - 1903244 - CVE-2020-29368 kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check
• BZ - 1905747 - kernel-rt-debug: WARNING: possible circular locking dependency detected(&serv->sv_lock -> (softirq_ctrl.lock).lock)
• BZ - 1906522 - CVE-2020-29660 kernel: locking inconsistency in drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c can lead to a read-after-free
• BZ - 1912683 - CVE-2021-20194 kernel: heap overflow in __cgroup_bpf_run_filter_getsockopt()
• BZ - 1913348 - CVE-2020-36158 kernel: buffer overflow in mwifiex_cmd_802_11_ad_hoc_start function in drivers/net/wireless/marvell/mwifiex/join.c via a long SSID value
• BZ - 1919893 - CVE-2020-0427 kernel: out-of-bounds reads in pinctrl subsystem.
• BZ - 1921958 - CVE-2021-3348 kernel: Use-after-free in ndb_queue_rq() in drivers/block/nbd.c
• BZ - 1923636 - CVE-2021-20239 kernel: setsockopt System Call Untrusted Pointer Dereference Information Disclosure
• BZ - 1930376 - CVE-2020-24504 kernel: Uncontrolled resource consumption in some Intel(R) Ethernet E810 Adapter drivers
• BZ - 1930379 - CVE-2020-24502 kernel: Improper input validation in some Intel(R) Ethernet E810 Adapter drivers
• BZ - 1930381 - CVE-2020-24503 kernel: Insufficient access control in some Intel(R) Ethernet E810 Adapter drivers
• BZ - 1941762 - CVE-2021-28950 kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode
• BZ - 1941784 - CVE-2021-28971 kernel: System crash in intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c
• BZ - 1945345 - CVE-2021-29646 kernel: improper input validation in tipc_nl_retrieve_key function in net/tipc/node.c
• BZ - 1945388 - CVE-2021-29650 kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS
• BZ - 1946965 - CVE-2021-31916 kernel: out of bounds array access in drivers/md/dm-ioctl.c
• BZ - 1948772 - CVE-2021-23133 kernel: Race condition in sctp_destroy_sock list_del
• BZ - 1951595 - CVE-2021-29155 kernel: protection for sequences of pointer arithmetic operations against speculatively out-of-bounds loads can be bypassed to leak content of kernel memory
• BZ - 1957788 - CVE-2021-31829 kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory
• BZ - 1959559 - CVE-2021-3489 kernel: Linux kernel eBPF RINGBUF map oversized allocation
• BZ - 1959642 - CVE-2020-24586 kernel: Fragmentation cache not cleared on reconnection
• BZ - 1959654 - CVE-2020-24587 kernel: Reassembling fragments encrypted under different keys
• BZ - 1959657 - CVE-2020-24588 kernel: wifi frame payload being parsed incorrectly as an L2 frame
• BZ - 1959663 - CVE-2020-26139 kernel: Forwarding EAPOL from unauthenticated wifi client
• BZ - 1960490 - CVE-2020-26140 kernel: accepting plaintext data frames in protected networks
• BZ - 1960492 - CVE-2020-26141 kernel: not verifying TKIP MIC of fragmented frames
• BZ - 1960496 - CVE-2020-26143 kernel: accepting fragmented plaintext frames in protected networks
• BZ - 1960498 - CVE-2020-26144 kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header
• BZ - 1960500 - CVE-2020-26145 kernel: accepting plaintext broadcast fragments as full frames
• BZ - 1960502 - CVE-2020-26146 kernel: reassembling encrypted fragments with non-consecutive packet numbers
• BZ - 1960504 - CVE-2020-26147 kernel: reassembling mixed encrypted/plaintext fragments
• BZ - 1964028 - CVE-2021-31440 kernel: local escalation of privileges in handling of eBPF programs
• BZ - 1964139 - CVE-2021-3564 kernel: double free in bluetooth subsystem when the HCI device initialization fails
• BZ - 1965038 - CVE-2021-0129 kernel: Improper access control in BlueZ may allow information disclosure vulnerability.
• BZ - 1965458 - CVE-2021-33200 kernel: out-of-bounds reads and writes due to enforcing incorrect limits for pointer arithmetic operations by BPF verifier
• BZ - 1966578 - CVE-2021-3573 kernel: use-after-free in function hci_sock_bound_ioctl()
• BZ - 1969489 - CVE-2020-36386 kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt() in net/bluetooth/hci_event.c
• BZ - 1975949 - CVE-2021-3659 kernel: NULL pointer dereference in llsec_key_alloc() in net/mac802154/llsec.c
• BZ - 1976946 - CVE-2021-3635 kernel: flowtable list del corruption with kernel BUG at lib/list_debug.c:50
• BZ - 1981954 - CVE-2021-3600 kernel: eBPF 32-bit source register truncation on div/mod
• BZ - 1989165 - CVE-2021-3679 kernel: DoS in rb_per_cpu_empty()
• BZ - 1995249 - CVE-2021-3732 kernel: overlayfs: Mounting overlayfs inside an unprivileged user namespace can reveal files

CVEs

• CVE-2019-14615
• CVE-2020-0427
• CVE-2020-24502
• CVE-2020-24503
• CVE-2020-24504
• CVE-2020-24586
• CVE-2020-24587
• CVE-2020-24588
• CVE-2020-26139
• CVE-2020-26140
• CVE-2020-26141
• CVE-2020-26143
• CVE-2020-26144
• CVE-2020-26145
• CVE-2020-26146
• CVE-2020-26147
• CVE-2020-29368
• CVE-2020-29660
• CVE-2020-36158
• CVE-2020-36312
• CVE-2020-36386
• CVE-2021-0129
• CVE-2021-3348
• CVE-2021-3489
• CVE-2021-3564
• CVE-2021-3573
• CVE-2021-3600
• CVE-2021-3635
• CVE-2021-3659
• CVE-2021-3679
• CVE-2021-3732
• CVE-2021-20194
• CVE-2021-20239
• CVE-2021-23133
• CVE-2021-28950
• CVE-2021-28971
• CVE-2021-29155
• CVE-2021-29646
• CVE-2021-29650
• CVE-2021-31440
• CVE-2021-31829
• CVE-2021-31916
• CVE-2021-33033
• CVE-2021-33200

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/