CVE-2026-63943 Details
Description
In the Linux kernel, the following vulnerability has been resolved: Input: xpad - fix out-of-bounds access for Share button xpadone_process_packet() receives len directly from urb->actual_length and uses it to index the share-button byte at data[len - 18] or data[len - 26]. Since both len and data[0] are under the device's control, a broken controller can send a GIP_CMD_INPUT packet with actual_length < 18 (e.g. 5 bytes) and reach this code path, causing accesses beyond the actual array. Fix this by calculating the offset and checking bounds against the packet length.
A vulnerability has been identified in the Linux kernel Xpad driver, specifically in the handling of input packets for Xbox One controllers. The issue arises in the 'xpadone_process_packet' function, where the length of the received data is used to access specific bytes related to the Share button. This creates a risk of out-of-bounds memory access, as a malfunctioning controller can send a packet with an actual length less than 18 bytes, leading to access beyond the intended array boundaries. The vulnerability has been addressed by implementing proper length checks and calculating offsets before accessing the data.
Users can upgrade to the patched version of the Linux kernel available in the official Linux Git repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 19, 2026 | New CVE Received | kernel.org |