Medium [CVE-2026-63927] Fix use after free in debug code
This medium-severity Red Hat Linux advisory covers CVE-2026-63927 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
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 "urb" after calling usb_hcd_giveback_urb() so save the urb->status ahead of time. A flaw was found in the Linux kernel, specifically within the `dwc2` USB driver.
This vulnerability, known as a use-after-free, occurs when the system attempts to access memory that has already been released. This happens because a USB Request Block (urb) is incorrectly accessed after it has been returned.
A local attacker could potentially exploit this issue to cause the system to crash (denial of service) or potentially gain unauthorized access or control.
This vulnerability is rated as Moderate because successful exploitation requires local privileges and is restricted to systems utilizing DesignWare USB2 controller hardware, primarily resulting in a denial of service via a kernel crash.
Typical Red Hat Enterprise Linux server and cloud deployments do not operate this specific USB hardware controller, significantly reducing real-world exposure. Furthermore, the vulnerable code is not present in Red Hat Enterprise Linux 7, 8, and 9, limiting potential impact to newer environments such as RHEL 10 and Red Hat In-Vehicle OS.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-825.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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