CVE-2024-42244 USB: serial: mos7840: fix crash on resume
A local attacker can cause a system crash by triggering a null pointer dereference in the mos7840 USB serial driver during device resume.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-42244?
CVE-2024-42244 is a medium-severity vulnerability in Linux kernel, published on 7 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: mos7840: fix crash on resume
Since commit c49cfa917025 ("USB: serial: use generic method if no alternative is provided in usb serial layer"), USB serial core calls the generic resume implementation when the driver has not provided one.
This can trigger a crash on resume with mos7840 since support for multiple read URBs was added back in 2011. Specifically, both port read URBs are now submitted on resume for open ports, but the context pointer of the second URB is left set to the core rather than mos7840 port structure.
Fix this by implementing dedicated suspend and resume functions for mos7840.
Tested with Delock 87414 USB 2.0 to 4x serial adapter.
[ johan: analyse crash and rewrite commit message; set busy flag on resume; drop bulk-in check; drop unnecessary usb_kill_urb() ]
Which versions are affected by CVE-2024-42244?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-42244?
Apply the vendor's patch.
Is CVE-2024-42244 being exploited?
There is no known exploitation of CVE-2024-42244 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-47558, AZL-47601, BELL-CVE-2024-42244, DEBIAN-CVE-2024-42244, GHSA-g9q3-4xq5-wqcj, UBUNTU-CVE-2024-42244.