# CVE-2021-47339: linux: In the Linux kernel, the following vulnerability has been resolved:  media: v4l2-core: explicitly clear ioctl input d...

CVE-2021-47339 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47339, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47339
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  media: v4l2-core: explicitly clear ioctl input data  As seen from a recent syzbot bug report, mistakes in the compat ioctl implementation can lead to uninitialized kernel stack data getting used as input for driver ioctl handlers.  The reported bug is now fixed, but it's possible that other related bugs are still present or get added in the future. As the drivers need to check user input already, the possible impact is fairly low, but it might still cause an information leak.  To be on the safe side, always clear the entire ioctl buffer before calling the conversion handler functions that are meant to initialize them.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47339](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47339.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47339](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47339.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47339](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47339.md) | May 21, 2024 |

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