drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO

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Summary

CVECVE-2026-63878
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:04 UTC
Updated2026-07-19 16:17:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO kvcalloc(args->num_entries, sizeof(*vm_entries), GFP_KERNEL) at amdgpu_gem.c:1050 uses the user-supplied num_entries directly without any upper bounds check. Since num_entries is a __u32 and sizeof(drm_amdgpu_gem_vm_entry) is 32 bytes, a large num_entries produces an allocation exceeding INT_MAX, triggering WARNING in __kvmalloc_node_noprof(), causing a kernel WARNING, TAINT_WARN, and panic on CONFIG_PANIC_ON_WARN=y systems. Add a size bounds check before we invoke the kvzalloc() to reject oversized num_entries early with -EINVAL. (cherry picked from commit 1fe7bf5457f6efd7be60b17e23163ba54341d73d)

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.097910000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4d82724f7f2b847eb0454b1aab5450545b39abd4 f059b4c493df3e54fe3ffe4658009c31864275da git Not specified
CNA Linux Linux affected 4d82724f7f2b847eb0454b1aab5450545b39abd4 967a00b8e06a7734aded23861faba9ee2462be87 git Not specified
CNA Linux Linux affected 4d82724f7f2b847eb0454b1aab5450545b39abd4 a1ba4594232c87c3b8defd6f89a2e40f8b08395d git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/967a00b8e06a7734aded23861faba9ee2462be87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f059b4c493df3e54fe3ffe4658009c31864275da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1ba4594232c87c3b8defd6f89a2e40f8b08395d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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