(RHSA-2020:2522) Important: kernel security and bug fix update

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)