CVE-2024-42244

low-risk

Published 2024-08-07

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() ]

Do I need to act?

0.03% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.5/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Linux Kernel

Affected Vendors

Linux

References (7)

Patch https://git.kernel.org/stable/c/1094ed500987e67a9d18b0f95e1812f1cc720856

Patch https://git.kernel.org/stable/c/553e67dec846323b5575e78a776cf594c13f98c4

Patch https://git.kernel.org/stable/c/5ae6a64f18211851c8df6b4221381c438b9a7348

Patch https://git.kernel.org/stable/c/932a86a711c722b45ed47ba2103adca34d225b33

Patch https://git.kernel.org/stable/c/b14aa5673e0a8077ff4b74f0bb260735e7d5e6a4

Patch https://git.kernel.org/stable/c/c15a688e49987385baa8804bf65d570e362f8576

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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low-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal