Vulnerability 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)
References
- https://git.kernel.org/stable/c/967a00b8e06a7734aded23861faba9ee2462be87
- https://git.kernel.org/stable/c/a1ba4594232c87c3b8defd6f89a2e40f8b08395d
- https://git.kernel.org/stable/c/f059b4c493df3e54fe3ffe4658009c31864275da
FAQ
What is CVE-2026-63878?
CVE-2026-63878 is a documented vulnerability. 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_ge...
How severe is CVE-2026-63878?
CVSS scoring is not yet available for CVE-2026-63878. Check NVD for updates.
Is there a patch for CVE-2026-63878?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.