Bug 1227766 (CVE-2024-40903)

Summary: VUL-0: CVE-2024-40903: kernel: usb: typec: tcpm: fix use-after-free case in tcpm_register_source_caps
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: andrea.mattiazzo, miroslav.franc
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/413830/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-40903:6.7:(AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-07-15 08:52:31 UTC 
In the Linux kernel, the following vulnerability has been resolved:

usb: typec: tcpm: fix use-after-free case in tcpm_register_source_caps

There could be a potential use-after-free case in
tcpm_register_source_caps(). This could happen when:
 * new (say invalid) source caps are advertised
 * the existing source caps are unregistered
 * tcpm_register_source_caps() returns with an error as
   usb_power_delivery_register_capabilities() fails

This causes port->partner_source_caps to hold on to the now freed source
caps.

Reset port->partner_source_caps value to NULL after unregistering
existing source caps.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40903
https://www.cve.org/CVERecord?id=CVE-2024-40903
https://git.kernel.org/stable/c/04c05d50fa79a41582f7bde8a1fd4377ae4a39e5
https://git.kernel.org/stable/c/4053696594d7235f3638d49a00cf0f289e4b36a3
https://git.kernel.org/stable/c/6b67b652849faf108a09647c7fde9b179ef24e2b
https://git.kernel.org/stable/c/e7e921918d905544500ca7a95889f898121ba886
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40903.mbox