# CVE-2022-50542: linux: In the Linux kernel, the following vulnerability has been resolved:  media: si470x: Fix use-after-free in si470x_int_...

CVE-2022-50542 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50542, released October 7, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50542
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 7, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  media: si470x: Fix use-after-free in si470x_int_in_callback()  syzbot reported use-after-free in si470x_int_in_callback() [1].  This indicates that urb->context, which contains struct si470x_device object, is freed when si470x_int_in_callback() is called.  The cause of this issue is that si470x_int_in_callback() is called for freed urb.  si470x_usb_driver_probe() calls si470x_start_usb(), which then calls usb_submit_urb() and si470x_start().  If si470x_start_usb() fails, si470x_usb_driver_probe() doesn't kill urb, but it just frees struct si470x_device object, as depicted below:  si470x_usb_driver_probe()   ...   si470x_start_usb()     ...     usb_submit_urb()     retval = si470x_start()     return retval   if (retval < 0)     free struct si470x_device object, but don't kill urb  This patch fixes this issue by killing urb when si470x_start_usb() fails and urb is submitted.  If si470x_start_usb() fails and urb is not submitted, i.e. submitting usb fails, it just frees struct si470x_device object.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50542](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50542.md) | Oct 7, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50542](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50542.md) | Oct 7, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50542](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50542.md) | Oct 7, 2025 |

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