CVE-2026-80782

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CVE-2026-80782

Summary: HID: magicmouse: do not keep a stale msc->input if no input is claimed

Details: In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: do not keep a stale msc->input if no input is claimed magicmouse_input_mapping() caches the first hid_input's input_dev in msc->input while the report descriptor is parsed, and the rest of the driver treats a non-NULL msc->input as proof that an input device was registered. That does not hold on the hid-input error path. If hidinput_connect() fails -- for instance because input_register_device() returns an error -- it unwinds through hidinput_disconnect(), which frees every input_dev it created, including the one cached in msc->input. The failure does not abort the probe. hid_connect() only skips the claim: if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev, connect_mask & HID_CONNECT_HIDINPUT_FORCE)) hdev->claimed |= HID_CLAIMED_INPUT; and the "device has no listeners" bailout below it does not fire for this driver, which sets ->raw_event; on the USB Magic Mouse 2 / Magic Trackpad 2 paths hidraw and hiddev are claimed as well. hid_hw_start() therefore returns 0 and magicmouse_probe() continues with msc->input pointing at freed memory. Being non-NULL, it passes the "input not registered" check in probe and the NULL checks in ->raw_event and ->event, so the next input report dereferences freed memory. Clear msc->input when the HID core did not claim an input device, so the existing NULL checks cover this case as well.

References: https://git.kernel.org/stable/c/0af3b89705688af01aa06025b84fa7a1e06ba6cc, https://git.kernel.org/stable/c/0bf253e9ac994cb5329bc87b00bb4eeca9136791, https://git.kernel.org/stable/c/15b60ade825c8ce9ec560048a4ae3747e4572be3, https://git.kernel.org/stable/c/2ef16934e069d5f771e989d6ee5c3ece5042f3cd, https://git.kernel.org/stable/c/3d7a7bac4c75f25b2513505a0ac5ba909588ed2b, https://git.kernel.org/stable/c/403cc9bd6ccb9fbe68d501c3236e5a6dd5504e14, https://git.kernel.org/stable/c/9bdf8c7bfd79f1090e61d28f969b32880fd77bb3, https://git.kernel.org/stable/c/c3597923932bb90d4fc2186aef552f6677175e4a, https://git.kernel.org/stable/c/e0c224c93d10ee38854fdf24c815108aedd3dcb3, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80782.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80782, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git