Heap-based Buffer Overflow Affecting kernel-rt package, versions <0:4.18.0-80.11.1.rt9.156.el8_0

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

The Broadcom brcmfmac WiFi driver prior to commit 1b5e2423164b3670e8bc9174e4762d297990deff is vulnerable to a heap buffer overflow. If the Wake-up on Wireless LAN functionality is configured, a malicious event frame can be constructed to trigger an heap buffer overflow in the brcmf_wowl_nd_results function. This vulnerability can be exploited with compromised chipsets to compromise the host, or when used in combination with CVE-2019-9503, can be used remotely. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

• https://access.redhat.com/security/cve/CVE-2019-9500
• https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html
• https://git.kernel.org/linus/1b5e2423164b3670e8bc9174e4762d297990deff
• https://kb.cert.org/vuls/id/166939/
• https://access.redhat.com/errata/RHSA-2019:2741