In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: use kvzalloc to allocate struct dc struct dc has grown large… (CVE-2026-68436)
A vulnerability in the Linux kernel's AMD GPU driver (amdgpu) related to the allocation of a large data structure (struct dc) has been resolved. The struct dc grew large enough to exceed the maximum contiguous memory allocation limit of the kernel's page allocator when allocated with kzalloc(), causing allocation failures. This failure leads to the amdgpu driver probe aborting and the display subsystem becoming unusable. The fix replaces kzalloc() with kvzalloc(), allowing fallback to vmalloc() for large allocations, preventing allocation failures and related warnings.
AI Analysis
Technical Summary
The Linux kernel's AMD GPU driver allocates a large software-only bookkeeping structure called struct dc using kzalloc(). As struct dc grew in size, it sometimes exceeded the kernel's maximum contiguous allocation limit (4 MiB), causing kzalloc() to fail and return NULL. This failure causes the dc_create() function to fail, which aborts the display manager initialization and causes the amdgpu driver probe to fail with an error (-EINVAL), leaving the display unusable. The vulnerability is resolved by changing the allocation method to kvzalloc(), which can fallback to vmalloc() for large allocations that do not require physically contiguous memory, thus avoiding allocation failures and kernel warnings.
Potential Impact
When struct dc exceeds the kernel's maximum contiguous allocation size, the amdgpu driver fails to initialize the display manager, causing the GPU driver probe to abort and the display to become unusable. This results in a denial of service for the display subsystem on affected systems running the vulnerable Linux kernel versions.
Mitigation Recommendations
A fix is available that changes the allocation of struct dc from kzalloc() to kvzalloc(), allowing fallback to vmalloc() for large allocations. Systems should update to a Linux kernel version that includes this fix to prevent amdgpu driver initialization failures and display outages. Patch status is confirmed by the vendor commit referenced in the advisory.
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: use kvzalloc to allocate struct dc struct dc has grown large… (CVE-2026-68436)
Description
A vulnerability in the Linux kernel's AMD GPU driver (amdgpu) related to the allocation of a large data structure (struct dc) has been resolved. The struct dc grew large enough to exceed the maximum contiguous memory allocation limit of the kernel's page allocator when allocated with kzalloc(), causing allocation failures. This failure leads to the amdgpu driver probe aborting and the display subsystem becoming unusable. The fix replaces kzalloc() with kvzalloc(), allowing fallback to vmalloc() for large allocations, preventing allocation failures and related warnings.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's AMD GPU driver allocates a large software-only bookkeeping structure called struct dc using kzalloc(). As struct dc grew in size, it sometimes exceeded the kernel's maximum contiguous allocation limit (4 MiB), causing kzalloc() to fail and return NULL. This failure causes the dc_create() function to fail, which aborts the display manager initialization and causes the amdgpu driver probe to fail with an error (-EINVAL), leaving the display unusable. The vulnerability is resolved by changing the allocation method to kvzalloc(), which can fallback to vmalloc() for large allocations that do not require physically contiguous memory, thus avoiding allocation failures and kernel warnings.
Potential Impact
When struct dc exceeds the kernel's maximum contiguous allocation size, the amdgpu driver fails to initialize the display manager, causing the GPU driver probe to abort and the display to become unusable. This results in a denial of service for the display subsystem on affected systems running the vulnerable Linux kernel versions.
Mitigation Recommendations
A fix is available that changes the allocation of struct dc from kzalloc() to kvzalloc(), allowing fallback to vmalloc() for large allocations. Systems should update to a Linux kernel version that includes this fix to prevent amdgpu driver initialization failures and display outages. Patch status is confirmed by the vendor commit referenced in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-7q8m-jhfw-frrf
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-68436"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a7c9b6abf8831d539cdf9fe
Added to database: 08/12/2026, 16:12:26 UTC
Last enriched: 08/12/2026, 17:20:12 UTC
Last updated: 08/13/2026, 00:41:14 UTC
Views: 2
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