(RHSA-2019:3055) 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: Use-after-free in __blk_drain_queue() function in block/blk-core.c (CVE-2018-20856)

• kernel: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c (CVE-2019-3846)

• hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB) (CVE-2019-9506)

• kernel: Heap overflow in mwifiex_uap_parse_tail_ies function in drivers/net/wireless/marvell/mwifiex/ie.c (CVE-2019-10126)

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 Fixes:

• gfs2: Fix iomap write page reclaim deadlock (BZ#1737373)

• [FJ7.6 Bug]: [REG] kernel: ipc: ipc_free should use kvfree (BZ#1740178)

• high update_cfs_rq_blocked_load contention (BZ#1740180)

• [Hyper-V][RHEL 7] kdump fails to start on a Hyper-V guest of Windows Server 2019. (BZ#1740188)

• kvm: backport cpuidle-haltpoll driver (BZ#1740192)

• Growing unreclaimable slab memory (BZ#1741920)

• [bnx2x] ping failed from pf to vf which has been attached to vm (BZ#1741926)

• [Hyper-V]vPCI devices cannot allocate IRQs vectors in a Hyper-V VM with > 240 vCPUs (i.e., when in x2APIC mode) (BZ#1743324)

• Macsec: inbound MACSEC frame is unexpectedly dropped with InPktsNotValid (BZ#1744442)

• RHEL 7.7 Beta - Hit error when trying to run nvme connect with IPv6 address (BZ#1744443)

• RHEL 7.6 SS4 - Paths lost when running straight I/O on NVMe/RoCE system (BZ#1744444)

• NFSv4.0 client sending a double CLOSE (leading to EIO application failure) (BZ#1744946)

• [Azure] CRI-RDOS | [RHEL 7.8] Live migration only takes 10 seconds, but the VM was unavailable for 2 hours (BZ#1748239)

• NFS client autodisconnect timer may fire immediately after TCP connection setup and may cause DoS type reconnect problem in complex network environments (BZ#1749290)

• [Inspur] RHEL7.6 ASPEED graphic card display issue (BZ#1749296)

• Allows macvlan to operated correctly over the active-backup mode to support bonding events. (BZ#1751579)

• [LLNL 7.5 Bug] slab leak causing a crash when using kmem control group (BZ#1752421)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs.