Bug 2507189 (CVE-2026-64334)

Summary: CVE-2026-64334 kernel: USB: serial: digi_acceleport: fix hard lockup on disconnect
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `digi_acceleport` USB serial driver. This vulnerability occurs when a USB device using the driver is disconnected, and operations such as opening or closing the device are happening concurrently. Persistent errors in sending out-of-band (OOB) write Universal Serial Bus Request Blocks (URBs) can cause the driver to enter an indefinite loop with interrupts disabled. This leads to a system hard lockup, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-07-25 10:09:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

USB: serial: digi_acceleport: fix hard lockup on disconnect

If submitting the OOB write urb fails persistently (e.g if the device is
being disconnected) the driver would loop indefinitely with interrupts
disabled.

Check for urb submission errors when sending OOB commands to avoid
hanging if, for example, open(), set_termios() or close() races with a
physical disconnect.

This is issue was flagged by Sashiko when reviewing an unrelated change
to the driver.
Comment 1 TEJ RATHI 2026-07-29 11:28:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072514-CVE-2026-64334-101f@gregkh/T