# CVE-2021-47444: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/edid: In connector_bad_edid() cap num_of_ext...

CVE-2021-47444 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47444, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47444
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 22, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read  In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid corruption test") the function connector_bad_edid() started assuming that the memory for the EDID passed to it was big enough to hold `edid[0x7e] + 1` blocks of data (1 extra for the base block). It completely ignored the fact that the function was passed `num_blocks` which indicated how much memory had been allocated for the EDID.  Let's fix this by adding a bounds check.  This is important for handling the case where there's an error in the first block of the EDID. In that case we will call connector_bad_edid() without having re-allocated memory based on `edid[0x7e]`.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.16-1 | [DEBIAN-CVE-2021-47444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47444.md) | May 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.16-1 | [DEBIAN-CVE-2021-47444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47444.md) | May 22, 2024 |
| Linux | linux Debian 14 | 5.14.16-1 | [DEBIAN-CVE-2021-47444](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47444.md) | May 22, 2024 |

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