CVE-2021-47444
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…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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]`.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dcPatch
- https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0Patch
- https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7Patch
- https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dcPatch
- https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0Patch
- https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.