Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c (CVE-2019-3846)
• Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS (CVE-2019-3887)
• kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results (CVE-2019-9500)
• kernel: Count overflow in FUSE request leading to use-after-free issues. (CVE-2019-11487)
• kernel: brcmfmac frame validation bypass (CVE-2019-9503)

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):

• BUG: scheduling while atomic in zswap (BZ#1726362)
• kernel-rt: update to the RHEL8.0.z batch#3 source tree (BZ#1734475)

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 Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.4 x86_64
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.2 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.4 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.2 x86_64

Fixes

• BZ - 1695044 - CVE-2019-3887 Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS
• BZ - 1701224 - CVE-2019-9500 kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results
• BZ - 1701842 - CVE-2019-9503 kernel: brcmfmac frame validation bypass
• BZ - 1703063 - CVE-2019-11487 kernel: Count overflow in FUSE request leading to use-after-free issues.
• BZ - 1713059 - CVE-2019-3846 kernel: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c
• BZ - 1726362 - BUG: scheduling while atomic in zswap [rhel-8.0.0.z]
• BZ - 1734475 - kernel-rt: update to the RHEL8.0.z batch#3 source tree

CVEs

• CVE-2018-19824
• CVE-2019-3846
• CVE-2019-3887
• CVE-2019-9500
• CVE-2019-9503
• CVE-2019-11487

References

• https://access.redhat.com/security/updates/classification/#important