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: nfs: use-after-free in svc_process_common() (CVE-2018-16884)
• Kernel: vhost_net: infinite loop while receiving packets leads to DoS (CVE-2019-3900)
• Kernel: page cache side channel attacks (CVE-2019-5489)
• hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB) (CVE-2019-9506)
• kernel: Heap overflow in mwifiex_uap_parse_tail_ies function in drivers/net/wireless/marvell/mwifiex/ie.c (CVE-2019-10126)
• Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)
• kernel: Information Disclosure in crypto_report_one in crypto/crypto_user.c (CVE-2018-19854)
• kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS (CVE-2018-20169)
• kernel: Heap address information leak while using L2CAP_GET_CONF_OPT (CVE-2019-3459)
• kernel: Heap address information leak while using L2CAP_PARSE_CONF_RSP (CVE-2019-3460)
• kernel: SCTP socket buffer memory leak leading to denial of service (CVE-2019-3874)
• kernel: denial of service vector through vfio DMA mappings (CVE-2019-3882)
• kernel: null-pointer dereference in hci_uart_set_flow_control (CVE-2019-10207)
• kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping (CVE-2019-11599)
• kernel: fs/ext4/extents.c leads to information disclosure (CVE-2019-11833)
• kernel: sensitive information disclosure from kernel stack memory via HIDPCONNADD command (CVE-2019-11884)
• kernel: use-after-free in arch/x86/lib/insn-eval.c (CVE-2019-13233)
• kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service (CVE-2019-15916)
• kernel: oob memory read in hso_probe in drivers/net/usb/hso.c (CVE-2018-19985)
• Kernel: KVM: leak of uninitialized stack contents to guest (CVE-2019-7222)
• Kernel: net: weak IP ID generation leads to remote device tracking (CVE-2019-10638)

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 8.1 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 8.4 x86_64
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.2 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.4 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.2 x86_64

Fixes

• BZ - 1656986 - CVE-2018-19854 kernel: Information Disclosure in crypto_report_one in crypto/crypto_user.c
• BZ - 1660375 - CVE-2018-16884 kernel: nfs: use-after-free in svc_process_common()
• BZ - 1660385 - CVE-2018-20169 kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS
• BZ - 1663176 - CVE-2019-3459 kernel: Heap address information leak while using L2CAP_GET_CONF_OPT
• BZ - 1663179 - CVE-2019-3460 kernel: Heap address information leak while using L2CAP_PARSE_CONF_RSP
• BZ - 1664110 - CVE-2019-5489 Kernel: page cache side channel attacks
• BZ - 1666106 - CVE-2018-19985 kernel: oob memory read in hso_probe in drivers/net/usb/hso.c
• BZ - 1671930 - CVE-2019-7222 Kernel: KVM: leak of uninitialized stack contents to guest
• BZ - 1678887 - RT: update RT source tree to the RHEL-8.1 tree
• BZ - 1686373 - CVE-2019-3874 kernel: SCTP socket buffer memory leak leading to denial of service
• BZ - 1689426 - CVE-2019-3882 kernel: denial of service vector through vfio DMA mappings
• BZ - 1698757 - CVE-2019-3900 Kernel: vhost_net: infinite loop while receiving packets leads to DoS
• BZ - 1700666 - Make kernel-rt require rt-setup
• BZ - 1705937 - CVE-2019-11599 kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping
• BZ - 1709837 - CVE-2019-11884 kernel: sensitive information disclosure from kernel stack memory via HIDPCONNADD command
• BZ - 1712072 - CVE-2019-11833 kernel: fs/ext4/extents.c leads to information disclosure
• BZ - 1716992 - CVE-2019-10126 kernel: Heap overflow in mwifiex_uap_parse_tail_ies function in drivers/net/wireless/marvell/mwifiex/ie.c
• BZ - 1724657 - BUG: scheduling while atomic in zswap
• BZ - 1727756 - CVE-2019-13233 kernel: use-after-free in arch/x86/lib/insn-eval.c
• BZ - 1727857 - CVE-2019-9506 hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB)
• BZ - 1728765 - BUG: scheduling while atomic: rcuc/13/134/0x00000002
• BZ - 1729931 - CVE-2019-10638 Kernel: net: weak IP ID generation leads to remote device tracking
• BZ - 1733472 - BUG: scheduling while atomic: rcuc/1/24/0x00000002
• BZ - 1733874 - CVE-2019-10207 kernel: null-pointer dereference in hci_uart_set_flow_control
• BZ - 1743931 - BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
• BZ - 1745646 - [RT] sched/fair: Robustify CFS-bandwidth timer locking
• BZ - 1746708 - CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer
• BZ - 1750813 - CVE-2019-15916 kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service

CVEs

• CVE-2018-16884
• CVE-2018-19854
• CVE-2018-19985
• CVE-2018-20169
• CVE-2019-3459
• CVE-2019-3460
• CVE-2019-3874
• CVE-2019-3882
• CVE-2019-3900
• CVE-2019-5489
• CVE-2019-7222
• CVE-2019-9506
• CVE-2019-10126
• CVE-2019-10207
• CVE-2019-10638
• CVE-2019-11599
• CVE-2019-11833
• CVE-2019-11884
• CVE-2019-13233
• CVE-2019-14821
• CVE-2019-15666
• CVE-2019-15916
• CVE-2019-15921
• CVE-2019-15924
• CVE-2019-16994
• CVE-2020-10720

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.1_release_notes/