CVE-2024-27040: drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()'
First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()' In the first if statement, we're checking if 'replay' is NULL. But in the second if statement, we're not checking if 'replay' is NULL again before calling replay->funcs->replay_set_power_opt(). if (replay == NULL && force_static) return false; ... if (link->replay_settings.replay_feature_enabled && replay->funcs->replay_set_power_opt) { replay->funcs->replay_set_power_opt(replay, *power_opts, panel_inst); link->replay_settings.replay_power_opt_active = *power_opts; } If 'replay' is NULL, this will cause a null pointer dereference. Fixes the below found by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_edp_panel_control.c:895 edp_set_replay_allow_active() error: we previously assumed 'replay' could be null (see line 887)
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- https://git.kernel.org/stable/c/d0e94f4807ff0df66cf447d6b4bbb8ac830e99c3
- https://git.kernel.org/stable/c/e7cadd5d3a8ffe334d0229ba9eda4290138d56e7
- https://git.kernel.org/stable/c/f610c46771ef1047e46d61807aa7c69cd29e63d8
- https://git.kernel.org/stable/c/f6aed043ee5d75b3d1bfc452b1a9584b63c8f76b
- https://launchpad.net/bugs/cve/CVE-2024-27040
- https://git.kernel.org/linus/f6aed043ee5d75b3d1bfc452b1a9584b63c8f76b
- https://security-tracker.debian.org/tracker/CVE-2024-27040
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-27040
- https://nvd.nist.gov/vuln/detail/CVE-2024-27040
- https://ubuntu.com/security/CVE-2024-27040
Frequently Asked Questions
What is the severity of CVE-2024-27040?
CVE-2024-27040 has a severity rating that reflects a potential impact on the integrity and availability of the Linux kernel, particularly within the AMD display driver.
How do I fix CVE-2024-27040?
To mitigate CVE-2024-27040, update your Linux kernel to versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, or 6.12.10-1.
Which versions of Linux are affected by CVE-2024-27040?
CVE-2024-27040 affects specific versions of the Linux kernel including those prior to the patched versions indicated.
What could happen if CVE-2024-27040 is exploited?
Exploiting CVE-2024-27040 could potentially lead to denial of service or unexpected behavior in systems using the affected versions of the Linux kernel.
Is there a workaround for CVE-2024-27040?
Currently, the recommended action for CVE-2024-27040 is to apply the necessary updates rather than relying on workarounds.
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