Bug 2481919 (CVE-2026-45853)

Summary: CVE-2026-45853 kernel: drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps_memranges()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `drm/amdgpu` component. The `amdgpu_discovery_get_nps_info()` function incorrectly deallocates memory by using `kfree()` instead of `kvfree()`, even when memory was allocated with `kvcalloc()` which may use `vmalloc()`. This improper memory handling can lead to memory corruption. Such a vulnerability could potentially be exploited by a local attacker to cause system instability or escalate privileges.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-27 15:02:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Use kvfree instead of kfree in amdgpu_gmc_get_nps_memranges()

amdgpu_discovery_get_nps_info() internally allocates memory for ranges
using kvcalloc(), which may use vmalloc() for large allocation. Using
kfree() to release vmalloc memory will lead to a memory corruption.

Use kvfree() to safely handle both kmalloc and vmalloc allocations.

Compile tested only. Issue found using a prototype static analysis tool
and code review.
Comment 1 Keith Grant 2026-05-28 04:43:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052709-CVE-2026-45853-9163@gregkh/T