6.8 - RHSA-2019:3220

Problem Description:

An update for kernel is now available for Red Hat Enterprise Linux 7.6 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.6) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.6) - ppc64, ppc64le, x86_64

3. Description:

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

Security Fix(es):

* Kernel: vhost_net: infinite loop while receiving packets leads to DoS (CVE-2019-3900)

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

* kernel: hw: Spectre SWAPGS gadget vulnerability (CVE-2019-1125)

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):

* [mlx4] VXLAN over VLAN TCP segmentation (BZ#1734325)

* Race condition in /dev/sg due to missing synchronization causes corruption in RHV (BZ#1737378)

* [FJ7.6 Bug]: [REG] kernel: ipc: ipc_free should use kvfree (BZ#1740177)

* high update_cfs_rq_blocked_load contention (BZ#1740179)

* kvm: backport cpuidle-haltpoll driver (BZ#1740191)

* Growing unreclaimable slab memory (BZ#1741919)

* [Hyper-V]vPCI devices cannot allocate IRQs vectors in a Hyper-V VM with > 240 vCPUs (i.e., when in x2APIC mode) (BZ#1743323)

* NFSv4.0 client sending a double CLOSE (leading to EIO application failure) (BZ#1744945)

* powerpc/pseries: Fix unitialized timer reset on migration / powerpc/pseries/mobility: Extend start/stop topology update scope (LPM) (BZ#1745441)

* ISST-LTE:PVM:Zeppelin :LPM: Failure logs and stack trace seen during LPM (POWER9/P9) (BZ#1745448)

* [LLNL 7.5 Bug] slab leak causing a crash when using kmem control group (BZ#1748237)

* [Azure] CRI-RDOS | [RHEL 7.8] Live migration only takes 10 seconds, but the VM was unavailable for 2 hours (BZ#1748238)

* Allows macvlan to operate correctly over the active-backup mode to support bonding events (BZ#1749291)

* debug kernel reports scheduling while atomic bug in EFI code (BZ#1755324)

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

1698757 - CVE-2019-3900 Kernel: vhost_net: infinite loop while receiving packets leads to DoS 1724389 - CVE-2019-1125 kernel: hw: Spectre SWAPGS gadget vulnerability 1727857 - CVE-2019-9506 hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB)