Riskcovery

CVE-2026-63878

drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO

State
Published
Severity
Not scored
Published
Jul 19, 2026
Updated
Jul 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

Description

In 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)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4d82724f7f2b847eb0454b1aab5450545b39abd4 to before f059b4c493df3e54fe3ffe4658009c31864275daAffected
  • 4d82724f7f2b847eb0454b1aab5450545b39abd4 to before 967a00b8e06a7734aded23861faba9ee2462be87Affected
  • 4d82724f7f2b847eb0454b1aab5450545b39abd4 to before a1ba4594232c87c3b8defd6f89a2e40f8b08395dAffected
LinuxLinux
  • 6.18Affected
  • before 6.18Not affected
  • 6.18.35 through 6.18.*Not affected
  • 7.0.12 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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