In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: Fix use after free in debug code We're not allowed to dereference… (CVE-2026-63927)
A use-after-free vulnerability in the Linux kernel's USB dwc2 driver debug code was fixed. The issue involved dereferencing a USB request block (urb) after it had been released by usb_hcd_giveback_urb(), which is not allowed. The fix involved saving the urb status before the release to prevent invalid memory access.
AI Analysis
Technical Summary
The Linux kernel's USB dwc2 driver contained a use-after-free vulnerability in its debug code. Specifically, the code dereferenced the urb pointer after calling usb_hcd_giveback_urb(), which frees the urb. This improper use-after-free was corrected by saving the urb->status prior to the call, preventing access to freed memory. This vulnerability has been resolved in the kernel.
Potential Impact
Use-after-free vulnerabilities can lead to kernel crashes or potential escalation of privileges if exploited. However, no known exploits are reported in the wild for this issue. The impact is limited to kernel stability and potential security risks related to memory corruption in the USB driver debug code.
Mitigation Recommendations
A fix has been applied to the Linux kernel to address this vulnerability. Users should update to the latest kernel versions containing this patch. Since this is a kernel-level fix, applying official kernel updates from the vendor or distribution is the recommended remediation.
In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: Fix use after free in debug code We're not allowed to dereference… (CVE-2026-63927)
Description
A use-after-free vulnerability in the Linux kernel's USB dwc2 driver debug code was fixed. The issue involved dereferencing a USB request block (urb) after it had been released by usb_hcd_giveback_urb(), which is not allowed. The fix involved saving the urb status before the release to prevent invalid memory access.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's USB dwc2 driver contained a use-after-free vulnerability in its debug code. Specifically, the code dereferenced the urb pointer after calling usb_hcd_giveback_urb(), which frees the urb. This improper use-after-free was corrected by saving the urb->status prior to the call, preventing access to freed memory. This vulnerability has been resolved in the kernel.
Potential Impact
Use-after-free vulnerabilities can lead to kernel crashes or potential escalation of privileges if exploited. However, no known exploits are reported in the wild for this issue. The impact is limited to kernel stability and potential security risks related to memory corruption in the USB driver debug code.
Mitigation Recommendations
A fix has been applied to the Linux kernel to address this vulnerability. Users should update to the latest kernel versions containing this patch. Since this is a kernel-level fix, applying official kernel updates from the vendor or distribution is the recommended remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fcv3-4h5f-37c2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63927"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ab2a4a8d598912f225
Added to database: 07/19/2026, 19:38:19 UTC
Last enriched: 07/19/2026, 20:07:19 UTC
Last updated: 07/20/2026, 07:21:50 UTC
Views: 8
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