Bug 1226612 (CVE-2024-38575)

Summary:	VUL-0: CVE-2024-38575: kernel: wifi: brcmfmac: pcie: handle randbuf allocation failure
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	camila.matos, gabriel.bertazi
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/411400/
Whiteboard:	CVSSv3.1:SUSE:CVE-2024-38575:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-06-20 12:58:11 UTC

In the Linux kernel, the following vulnerability has been resolved:

wifi: brcmfmac: pcie: handle randbuf allocation failure

The kzalloc() in brcmf_pcie_download_fw_nvram() will return null
if the physical memory has run out. As a result, if we use
get_random_bytes() to generate random bytes in the randbuf, the
null pointer dereference bug will happen.

In order to prevent allocation failure, this patch adds a separate
function using buffer on kernel stack to generate random bytes in
the randbuf, which could prevent the kernel stack from overflow.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-38575
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-38575.mbox
https://git.kernel.org/stable/c/0eb2c0528e232b3c32cde9d5e1c9f80ba2996e49
https://git.kernel.org/stable/c/c37466406f075476c2702ecc01917928af871f3b
https://git.kernel.org/stable/c/7c15eb344b0d4d3468c9b2a7591ad2b859b29b88
https://git.kernel.org/stable/c/3729ca9e48d19a03ae049e2bde510e161c2f3720
https://git.kernel.org/stable/c/316f790ebcf94bdf59f794b7cdea4068dc676d4c
https://www.cve.org/CVERecord?id=CVE-2024-38575