Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

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.

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)

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 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL 7.6 x86_64

Fixes

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

CVEs

• CVE-2019-1125
• CVE-2019-3900
• CVE-2019-9506

References