RHSA-2020:0375 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

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_vs_ie() function of Marvell WiFi driver (CVE-2019-14816)
• kernel: heap-based buffer overflow in mwifiex_process_country_ie() function in drivers/net/wireless/marvell/mwifiex/sta_ioctl.c (CVE-2019-14895)
• kernel: heap overflow in marvell/mwifiex/tdls.c (CVE-2019-14901)
• kernel: buffer overflow in cfg80211_mgd_wext_giwessid in net/wireless/wext-sme.c (CVE-2019-17133)
• kernel: incomplete fix for race condition between mmget_not_zero()/get_task_mm() and core dumping in CVE-2019-11599 (CVE-2019-14898)

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):

• patchset for x86/atomic: Fix smp_mb__{before,after}_atomic() [kernel-rt] (BZ#1772522)
• kernel-rt: update to the RHEL7.7.z batch#4 source tree (BZ#1780322)
• kvm nx_huge_pages_recovery_ratio=0 is needed to meet KVM-RT low latency requirement (BZ#1781157)
• kernel-rt: hard lockup panic in during execution of CFS bandwidth period timer (BZ#1788057)

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 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64
• Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 1744149 - CVE-2019-14816 kernel: heap overflow in mwifiex_update_vs_ie() function of Marvell WiFi driver
• BZ - 1771909 - CVE-2019-17133 kernel: buffer overflow in cfg80211_mgd_wext_giwessid in net/wireless/wext-sme.c
• BZ - 1773519 - CVE-2019-14901 kernel: heap overflow in marvell/mwifiex/tdls.c
• BZ - 1774671 - CVE-2019-14898 kernel: incomplete fix for race condition between mmget_not_zero()/get_task_mm() and core dumping in CVE-2019-11599
• BZ - 1774870 - CVE-2019-14895 kernel: heap-based buffer overflow in mwifiex_process_country_ie() function in drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
• BZ - 1781157 - kvm nx_huge_pages_recovery_ratio=0 is needed to meet KVM-RT low latency requirement [rhel-7.7.z]

CVEs

• CVE-2019-14816
• CVE-2019-14895
• CVE-2019-14898
• CVE-2019-14901
• CVE-2019-17133

References

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