Univention Corporate Server 4.3 erratum 534 (security)

This update addresses the following issues:
* Heap overflow in mwifiex_update_bss_desc_with_ie function in
  marvell/mwifiex/scan.c (CVE-2019-3846)
* page cache side channel attacks (CVE-2019-5489)
* brcmfmac heap buffer overflow in brcmf_wowl_nd_results (CVE-2019-9500)
* brcmfmac frame validation bypass (CVE-2019-9503)
* Heap Overflow in mwifiex_uap_parse_tail_ies function in
  drivers/net/wireless/marvell/mwifiex/ie.c (CVE-2019-10126)
* tcp: integer overflow while processing SACK blocks allows remote denial of
  service (CVE-2019-11477)
* tcp: excessive resource consumption while processing SACK blocks allows
  remote denial of service (CVE-2019-11478)
* tcp: excessive resource consumption for TCP connections with low MSS allows
  remote denial of service (CVE-2019-11479)
* multiple race conditions in Siemens R3964 line discipline driver in
  drivers/tty/n_r3964.c leading to denial of service (CVE-2019-11486)
* fix race condition between mmget_not_zero()/get_task_mm() and core dumping
  (CVE-2019-11599)
* race condition in rds_tcp_kill_sock in net/rds/tcp.c leading to
  use-after-free (CVE-2019-11815)
* fs/ext4/extents.c leads to information disclosure (CVE-2019-11833)
* sensitive information disclosure from kernel stack memory via HIDPCONNADD
  command (CVE-2019-11884)