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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.14.16-1 | DEBIAN-CVE-2021-47444 | May 22, 2024 |
| linux · Debian 13.5 (trixie) | 5.14.16-1 | DEBIAN-CVE-2021-47444 | May 22, 2024 |
| linux · Debian 14 | 5.14.16-1 | DEBIAN-CVE-2021-47444 | May 22, 2024 |
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