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

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-19 · updated 2026-10-30
Weakness: CWE-125

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.

Affected products

Linux kernel: from 6.6.91 before 6.6.143; from 6.12.29 before 6.12.93; from 6.14.7 before 6.15; from 6.15.1 before 6.18.35; from 6.19 before 7.0.12; 6.15-rc6, 6.15-rc7, 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4 (+1) — fixed in 6.6.143, 6.12.93, 6.15, 6.18.35, 7.0.12
Linux kernel: from 6.6.91 before 6.6.143; from 6.12.29 before 6.12.93; from 6.14.7 before 6.15; 6.15 — fixed in 6.12.93, 6.15, 6.6.143, 7.1

How to fix

Upgrade to a fixed version: Linux kernel 6.6.143, 6.12.93, 6.15, 6.18.35; Linux kernel 6.12.93, 6.15, 6.6.143, 7.1. Check the vendor advisory for mitigations.

References

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