(RHSA-2020:1567) Important: kernel-rt security, bug fix, and enhancement update

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: use-after-free in __blk_add_trace in kernel/trace/blktrace.c (CVE-2019-19768)

• kernel: nfs: NULL pointer dereference due to an anomalized NFS message sequence (CVE-2018-16871)

• kernel: memory leak in the kernel_read_file function in fs/exec.c allows to cause a denial of service (CVE-2019-8980)

• kernel: unprivileged users able to create RAW sockets in AF_IEEE802154 network protocol. (CVE-2019-17053)

• kernel: unprivileged users able to create RAW sockets in AF_ISDN network protocol. (CVE-2019-17055)

• kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp_input.c (CVE-2019-18805)

• kernel: information leak bug caused by a malicious USB device in the drivers/net/can/usb/peak_usb/pcan_usb_core.c driver (CVE-2019-19534)

• kernel: some ipv6 protocols not encrypted over ipsec tunnel. (CVE-2020-1749)

• Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR (CVE-2019-10639)

• kernel: An out-of-bounds read in drivers/scsi/qedi/qedi_dbg.c leading to crash or information disclosure (CVE-2019-15090)

• kernel: a NULL pointer dereference in drivers/net/wireless/ath/ath10k/usb.c leads to a crash (CVE-2019-15099)

• kernel: Null pointer dereference in the sound/usb/line6/pcm.c (CVE-2019-15221)

• kernel: Two memory leaks in the mwifiex_pcie_init_evt_ring() function in drivers/net/wireless/marvell/mwifiex/pcie.c allows for a DoS (CVE-2019-19057)

• kernel: Memory leaks in drivers/net/wireless/ath/ath9k/htc_hst.c in the Linux kernel (DOS) (CVE-2019-19073)

• kernel: a memory leak in the ath9k management function in allows local DoS (CVE-2019-19074)

• kernel: when cpu.cfs_quota_us is used allows attackers to cause a denial of service against non-cpu-bound applications (CVE-2019-19922)

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):

• RT: update RT source tree to the RHEL-8.2 tree (BZ#1708716)

• KVM-RT guest fails boot with emulatorsched (BZ#1712781)

• 8 vCPU guest need max latency < 20 us with stress [RT-8.2] (BZ#1757165)

• Request nx_huge_pages=N as default value to avoid kvm-rt guest large latency spike [rt-8] (BZ#1788352)

• RT: Add rpm Provide of ‘kernel’ to indicate that this is a kernel package (BZ#1796284)

• [RHEL8] RT kernel signed by test certificate and not Red Hat Secure Boot (BZ#1806871)

Enhancement(s):

• update to the upstream 5.x RT patchset (BZ#1680161)