Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.7 Extended Update Support.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: double free may be caused by the function allocate_trace_buffer in the file kernel/trace/trace.c (CVE-2017-18595)
• kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c (CVE-2019-19768)
• Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711)
• kernel: denial of service via ioctl call in network tun handling (CVE-2018-7191)
• kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS (CVE-2018-20169)
• kernel: perf_event_open() and execve() race in setuid programs allows a data leak (CVE-2019-3901)
• kernel: brcmfmac frame validation bypass (CVE-2019-9503)
• kernel: unchecked kstrdup of fwstr in drm_load_edid_firmware leads to denial of service (CVE-2019-12382)
• kernel: use-after-free in arch/x86/lib/insn-eval.c (CVE-2019-13233)
• kernel: integer overflow and OOB read in drivers/block/floppy.c (CVE-2019-14283)
• kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service (CVE-2019-15916)
• Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR (CVE-2019-10639)

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):

• Backport: Guest microcode version mismatch on secondary processors (BZ#1814002)
• Realtek 8111, 8112 stop working after upgrading to 3.10.0-1062 (BZ#1814601)
• [mlx5] Crash on reboot while having VF configured and in switchdev mode (BZ#1814800)
• qla2xxx: Urgent driver fix needed. Initiator does not relogin to target after receiving an explicit logout (BZ#1815595)
• High iSCSI read latency resolved by 'tcp: implement coalescing on backlog queue' (BZ#1817498)
• [RHEL7.8][Azure]Commits to resolve high network latency (BZ#1817934)
• NETDEV WATCHDOG: enp3s0 (r8169): transmit queue 0 timed out (BZ#1822541)
• RHEL7: block mq hang of a blk_mq_freeze_queue_wait(), which waits for a zero of a q_usage_counter, which never happens (BZ#1824545)
• Kernel crashes with a message fs/fscache/operation.c:449! (BZ#1826293)
• kernel BUG at fs/fscache/operation.c:70! FS-Cache: 4 == 5 is false - current state is FSCACHE_OP_ST_COMPLETE but should be FSCACHE_OP_CANCELLED in fscache_enqueue_operation (BZ#1839756)

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 x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.7 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.7 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.7 x86_64

Fixes

• BZ - 1660385 - CVE-2018-20169 kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS
• BZ - 1701245 - CVE-2019-3901 kernel: perf_event_open() and execve() race in setuid programs allows a data leak
• BZ - 1701842 - CVE-2019-9503 kernel: brcmfmac frame validation bypass
• BZ - 1715554 - CVE-2019-12382 kernel: unchecked kstrdup of fwstr in drm_load_edid_firmware leads to denial of service
• BZ - 1716328 - CVE-2018-7191 kernel: denial of service via ioctl call in network tun handling
• BZ - 1727756 - CVE-2019-13233 kernel: use-after-free in arch/x86/lib/insn-eval.c
• BZ - 1729933 - CVE-2019-10639 Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR
• BZ - 1734243 - CVE-2019-14283 kernel: integer overflow and OOB read in drivers/block/floppy.c
• BZ - 1750813 - CVE-2019-15916 kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service
• BZ - 1758671 - CVE-2017-18595 kernel: double free may be caused by the function allocate_trace_buffer in the file kernel/trace/trace.c
• BZ - 1786164 - CVE-2019-19768 kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c
• BZ - 1825116 - CVE-2020-10711 Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic

CVEs

• CVE-2017-18595
• CVE-2018-7191
• CVE-2018-20169
• CVE-2019-3901
• CVE-2019-9503
• CVE-2019-10639
• CVE-2019-12382
• CVE-2019-13233
• CVE-2019-14283
• CVE-2019-15916
• CVE-2019-19768
• CVE-2020-10711

References

• https://access.redhat.com/security/updates/classification/#important