Medium [CVE-2026-63878] check num_entries in GEM_OP GET_MAPPING_INFO
This medium-severity Red Hat Linux advisory covers CVE-2026-63878 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9.
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Summary
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) A local attacker can exploit an integer overflow vulnerability by providing an excessively large value for the `num_entries` parameter in the `GEM_OP GET_MAPPING_INFO` ioctl.
This can lead to an attempt to allocate an extremely large amount of memory, resulting in a kernel warning, system taint, and potentially a system panic, causing a Denial of Service (DoS).
This vulnerability is rated as Moderate severity because exploitation is restricted to local authenticated users with access to AMD GPU device nodes and results strictly in a denial of service without compromising system confidentiality or integrity.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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