CVE-2023-53840 Details
Description
In the Linux kernel, the following vulnerability has been resolved: usb: early: xhci-dbc: Fix a potential out-of-bound memory access If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the string is not guaranteed to be NULL terminated when xdbc_trace() is called. Reserve an extra byte, which will be zeroed automatically because 'buf' is a static variable, in order to avoid troubles, should it happen.
A potential out-of-bounds memory access vulnerability has been identified in the Linux kernel's USB early XHCI debug capability driver. This issue arises because the function 'xdbc_bulk_write()' may fail, leaving the 'buf' variable with arbitrary values. Consequently, the string may not be properly NULL-terminated when 'xdbc_trace()' is invoked, leading to undefined behavior. The vulnerability affects several versions of the Linux kernel.
Users can upgrade to the latest version of the Linux kernel, where this vulnerability has been addressed. Instructions for upgrading the kernel can be found in the official Linux documentation or through the package management system of the respective Linux distribution.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Dec 9, 2025References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/351c8d8650d1ccc006255fa01f98b6c6496a02e5 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/a4a97ab3db5c081eb6e7dba91306adefb461e0bd | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/df7c8aba7309f4dc55df94e06b67f576c0f52406 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0 | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Dec 9, 2025 | New CVE Received | kernel.org |