CVE-2024-27041: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix NULL checks for adev->dm.dc in amdgpu_dm_fini() Since 'adev->dm.dc' in amdgpu_dm_fini() might turn out to be NULL before the call to dc_enable_dmub_notifications(), check beforehand to ensure there will not be a possible NULL-ptr-deref there. Also, since commit 1e88eb1b2c25 ("drm/amd/display: Drop CONFIG_DRM_AMD_DC_HDCP") there are two separate checks for NULL in 'adev->dm.dc' before dc_deinit_callbacks() and dc_dmub_srv_destroy(). Clean up by combining them all under one 'if'. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.14 — 6.6.23
linux	linux_kernel	6.7 — 6.7.11
linux	linux_kernel	6.8 — 6.8.2

References

Advisories & Patches

https://git.kernel.org/stable/c/1c62697e4086de988b31124fb8c79c244ea05f2b https://git.kernel.org/stable/c/2a3cfb9a24a28da9cc13d2c525a76548865e182c https://git.kernel.org/stable/c/ca2eb375db76fd50f31afdd67d6ca4f833254957 https://git.kernel.org/stable/c/e040f1fbe9abae91b12b074cfc3bbb5367b79811 https://git.kernel.org/stable/c/1c62697e4086de988b31124fb8c79c244ea05f2b https://git.kernel.org/stable/c/2a3cfb9a24a28da9cc13d2c525a76548865e182c https://git.kernel.org/stable/c/ca2eb375db76fd50f31afdd67d6ca4f833254957 https://git.kernel.org/stable/c/e040f1fbe9abae91b12b074cfc3bbb5367b79811

Frequently Asked Questions

What is CVE-2024-27041? +

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix NULL checks for adev->dm.dc in amdgpu_dm_fini() Since 'adev->dm.dc' in amdgpu_dm_fini() might turn out to be NULL before the call to dc_enable_dmub_notifications(), check beforehand to ensure there will not be a possible NULL-ptr-deref there. Also, since commit 1e88eb1b2c25 ("drm/amd/display: Drop CONFIG_DRM_AMD_DC_HDCP") there are two separate checks for NULL in 'adev->dm.dc' before dc_deinit_callbacks() and dc_dmub_srv_destroy(). Clean up by combining them all under one 'if'. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-27041? +

CVE-2024-27041 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-27041? +

CVE-2024-27041 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-27041? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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