CVE-2024-26729: drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv
First published: Wed Apr 03 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv Fixes potential null pointer dereference warnings in the dc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up() functions. In both functions, the 'dc_dmub_srv' variable was being dereferenced before it was checked for null. This could lead to a null pointer dereference if 'dc_dmub_srv' is null. The fix is to check if 'dc_dmub_srv' is null before dereferencing it. Thus moving the null checks for 'dc_dmub_srv' to the beginning of the functions to ensure that 'dc_dmub_srv' is not null when it is dereferenced. Found by smatch & thus fixing the below: drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128) drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check 'dc_dmub_srv' (see line 1164)
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=6.7<6.7.7 | |
| Linux kernel | =6.8-rc1 | |
| Linux kernel | =6.8-rc2 | |
| Linux kernel | =6.8-rc3 | |
| Linux kernel | =6.8-rc4 | |
| Linux kernel | =6.8-rc5 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-26729?
CVE-2024-26729 has been classified with a critical severity due to the potential impact of null pointer dereferences in the Linux kernel.
What software versions are affected by CVE-2024-26729?
CVE-2024-26729 affects Linux kernel versions from 6.7 to 6.8-rc5.
What causes the vulnerability in CVE-2024-26729?
CVE-2024-26729 is caused by potential null pointer dereference warnings in specific display functions of the AMD display driver.
How do I fix CVE-2024-26729?
To fix CVE-2024-26729, you should update your Linux kernel to the latest available patched version.
Is there a workaround for CVE-2024-26729?
There are no recommended workarounds for CVE-2024-26729; the best mitigation is to apply the security update.
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