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: 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)

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

Fixes

• BZ - 1655162 - CVE-2018-16871 kernel: nfs: NULL pointer dereference due to an anomalized NFS message sequence
• BZ - 1679972 - CVE-2019-8980 kernel: memory leak in the kernel_read_file function in fs/exec.c allows to cause a denial of service
• BZ - 1708716 - RT: update RT source tree to the RHEL-8.2 tree
• BZ - 1712781 - KVM-RT guest fails boot with emulatorsched
• BZ - 1729933 - CVE-2019-10639 Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR
• BZ - 1743526 - CVE-2019-15090 kernel: An out-of-bounds read in drivers/scsi/qedi/qedi_dbg.c leading to crash or information disclosure
• BZ - 1743560 - CVE-2019-15099 kernel: a NULL pointer dereference in drivers/net/wireless/ath/ath10k/usb.c leads to a crash
• BZ - 1749974 - CVE-2019-15221 kernel: Null pointer dereference in the sound/usb/line6/pcm.c
• BZ - 1757165 - 8 vCPU guest need max latency < 20 us with stress [RT-8.2]
• BZ - 1758242 - CVE-2019-17053 kernel: unprivileged users able to create RAW sockets in AF_IEEE802154 network protocol.
• BZ - 1758248 - CVE-2019-17055 kernel: unprivileged users able to create RAW sockets in AF_ISDN network protocol.
• BZ - 1768730 - [kernel-rt-debug] BUG: MAX_LOCKDEP_CHAINS too low!
• BZ - 1771496 - CVE-2019-18805 kernel: integer overflow in tcp_ack_update_rtt in net/ipv4/tcp_input.c
• BZ - 1772738 - kvm nx_huge_pages_recovery_ratio=0 is needed to meet KVM-RT low latency requirement
• BZ - 1774933 - CVE-2019-19074 kernel: a memory leak in the ath9k management function in allows local DoS
• BZ - 1774937 - CVE-2019-19073 kernel: Memory leaks in drivers/net/wireless/ath/ath9k/htc_hst.c in the Linux kernel (DOS)
• BZ - 1775050 - CVE-2019-19057 kernel: Two memory leaks in the mwifiex_pcie_init_evt_ring() function in drivers/net/wireless/marvell/mwifiex/pcie.c allows for a DoS
• BZ - 1783540 - CVE-2019-19534 kernel: information leak bug caused by a malicious USB device in the drivers/net/can/usb/peak_usb/pcan_usb_core.c driver
• BZ - 1786164 - CVE-2019-19768 kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c
• BZ - 1788352 - Request nx_huge_pages=N as default value to avoid kvm-rt guest large latency spike [rt-8]
• BZ - 1792512 - CVE-2019-19922 kernel: when cpu.cfs_quota_us is used allows attackers to cause a denial of service against non-cpu-bound applications
• BZ - 1796284 - RT: Add rpm Provide of 'kernel' to indicate that this is a kernel package
• BZ - 1806871 - [RHEL8] RT kernel signed by test certificate and not Red Hat Secure Boot
• BZ - 1809833 - CVE-2020-1749 kernel: some ipv6 protocols not encrypted over ipsec tunnel.

CVEs

• CVE-2018-16871
• CVE-2019-5108
• CVE-2019-8980
• CVE-2019-10639
• CVE-2019-12819
• CVE-2019-15090
• CVE-2019-15099
• CVE-2019-15221
• CVE-2019-15223
• CVE-2019-16234
• CVE-2019-17053
• CVE-2019-17055
• CVE-2019-18282
• CVE-2019-18805
• CVE-2019-19045
• CVE-2019-19047
• CVE-2019-19055
• CVE-2019-19057
• CVE-2019-19058
• CVE-2019-19059
• CVE-2019-19065
• CVE-2019-19067
• CVE-2019-19073
• CVE-2019-19074
• CVE-2019-19077
• CVE-2019-19532
• CVE-2019-19534
• CVE-2019-19768
• CVE-2019-19922
• CVE-2020-1749
• CVE-2020-7053
• CVE-2020-10690

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.2_release_notes/index