CVE-2021-47444

drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read

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]`.

N/A

CVSS

Severity:

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7
https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc
https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0

Frequently Asked Questions

What is the severity of CVE-2021-47444?: CVE-2021-47444 has not yet been assigned a CVSS score.
How to fix CVE-2021-47444?: To fix CVE-2021-47444, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47444 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-47444 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47444?: CVE-2021-47444 affects Linux Linux, Linux Linux.

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