CVE-2026-63943
Input: xpad - fix out-of-bounds access for Share button
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the xpad fix.
- Ensure bounds checking for packet data.
- Validate input lengths before indexing.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63943.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63943 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63943
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63943 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63943 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cbc82e7db16d59c301457312a624a7de2c03cd4a', 'lessThan': 'bcfb4833cd4078a1a356ef451838b75cd233099e', 'versionType': 'git'}, {'status': 'affected', 'version': '302a0cd0bbc450998429a3f4267970a4b93251a8', 'lessThan': '37ec54abfdd63a63fd50734a9c4e4cbc1e5795af', 'versionType': 'git'}, {'status': 'affected', 'version': '4ef46367073b107ec22f46fe5f12176e87c238e8', 'lessThan': '9749db57233b396353ad5dee81eec9d9880c9246', 'versionType': 'git'}, {'status': 'affected', 'version': '4ef46367073b107ec22f46fe5f12176e87c238e8', 'lessThan': '6346b0895b574ce45f3747b9c508c72f70e6abef', 'versionType': 'git'}, {'status': 'affected', 'version': '4ef46367073b107ec22f46fe5f12176e87c238e8', 'lessThan': '6cdc46b38cf146ce81d4831b6472dbf7731849a2', 'versionType': 'git'}, {'status': 'affected', 'version': 'a7e3ddd1d9a3d0b26465ed01d464e3c05479ebc8', 'versionType': 'git'}, {'status': 'affected', 'version': '6.6.91', 'lessThan': '6.6.143', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.29', 'lessThan': '6.12.93', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.14.7', 'lessThan': '6.15', 'versionType': 'semver'}], 'programFiles': ['drivers/input/joystick/xpad.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/input/joystick/xpad.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/37ec54abfdd63a63fd50734a9c4e4cbc1e5795af Added Reference https://git.kernel.org/stable/c/6346b0895b574ce45f3747b9c508c72f70e6abef Added Reference https://git.kernel.org/stable/c/6cdc46b38cf146ce81d4831b6472dbf7731849a2 Added Reference https://git.kernel.org/stable/c/9749db57233b396353ad5dee81eec9d9880c9246 Added Reference https://git.kernel.org/stable/c/bcfb4833cd4078a1a356ef451838b75cd233099e