Bug 1225745 (CVE-2024-36911)

Summary: VUL-0: CVE-2024-36911: kernel: hv_netvsc: Don't free decrypted memory
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: REOPENED --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: andrea.mattiazzo, mkoutny
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/408227/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-36911:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-05-31 12:12:56 UTC 
In the Linux kernel, the following vulnerability has been resolved:

hv_netvsc: Don't free decrypted memory

In CoCo VMs it is possible for the untrusted host to cause
set_memory_encrypted() or set_memory_decrypted() to fail such that an
error is returned and the resulting memory is shared. Callers need to
take care to handle these errors to avoid returning decrypted (shared)
memory to the page allocator, which could lead to functional or security
issues.

The netvsc driver could free decrypted/shared pages if
set_memory_decrypted() fails. Check the decrypted field in the gpadl
to decide whether to free the memory.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36911
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36911.mbox
https://git.kernel.org/stable/c/a56fe611326332bf6b7126e5559590c57dcebad4
https://git.kernel.org/stable/c/4aaed9dbe8acd2b6114458f0498a617283d6275b
https://git.kernel.org/stable/c/bbf9ac34677b57506a13682b31a2a718934c0e31
https://www.cve.org/CVERecord?id=CVE-2024-36911
Comment 2 Olaf Hering 2024-07-10 16:34:31 UTC 
fixes submitted to for-next.
Comment 3 Olaf Hering 2024-07-10 19:59:14 UTC 
security-team@suse.de