# CVE-2026-97483: Linux kernel USB core deadlock in root hub control transfers

Source: https://junglewise.ai/threats/cve-2026-97483-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-97483 · Severity: info · Published 2026-09-24

The Linux kernel's USB subsystem can deadlock when handling control transfers to root hubs during SCSI error recovery. When a storage device needs to be reset within the SCSI error handler, the kernel may attempt memory allocations that can trigger additional I/O, causing the system to hang. A fix ensures that memory allocation flags are properly passed through the USB control transfer path to prevent blocking operations in error contexts.

Technologies: [Linux kernel](https://junglewise.ai/threats/technologies/x-linux-kernel).

## Quick answers

**Is CVE-2026-97483 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-97483 being exploited in the wild.

**How severe is CVE-2026-97483?** Informational severity, published 24 September 2026.

**Which products and versions are affected?** Linux kernel 2.6.11 through 7.2 and later.

**Is there a fix for CVE-2026-97483?** A patch was published on 2026-05-22: Fix merged upstream Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-97483 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-97483?** Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A deadlock condition occurs in the USB Host Controller Driver (HCD) when rh_call_control() performs memory allocation with GFP_KERNEL flags during root hub control transfers initiated from the SCSI error handler. The vulnerability stems from improper handling of memory allocation flags when resetting devices—the mem_flags parameter passed to usb_submit_urb() was not propagated to internal memory allocation calls. The fix modifies rh_call_control() and rh_urb_enqueue() to accept and use the mem_flags parameter, replacing hardcoded GFP_KERNEL with the appropriate flags.

## Affected products

- Linux Kernel 2.6.11 through 7.2 and later

## Timeline

- 2026-09-24: disclosed
- 2026-05-22: patched: Fix merged upstream

## References

- [https://git.kernel.org/stable/c/549672a3fb6b36ea408238f89ecf9f41d2da6225](https://git.kernel.org/stable/c/549672a3fb6b36ea408238f89ecf9f41d2da6225)
- [https://git.kernel.org/stable/c/d5559f43d76b398392b26a15cbc16d731969cd1c](https://git.kernel.org/stable/c/d5559f43d76b398392b26a15cbc16d731969cd1c)

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