CVE-2026-63878 (GCVE-0-2026-63878)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-07-19 14:54
VLAI
Title
drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO
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)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4d82724f7f2b847eb0454b1aab5450545b39abd4 , < f059b4c493df3e54fe3ffe4658009c31864275da (git)
Affected: 4d82724f7f2b847eb0454b1aab5450545b39abd4 , < 967a00b8e06a7734aded23861faba9ee2462be87 (git)
Affected: 4d82724f7f2b847eb0454b1aab5450545b39abd4 , < a1ba4594232c87c3b8defd6f89a2e40f8b08395d (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"
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              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO\n\nkvcalloc(args-\u003enum_entries, sizeof(*vm_entries), GFP_KERNEL) at\namdgpu_gem.c:1050 uses the user-supplied num_entries directly without\nany upper bounds check. Since num_entries is a __u32 and\nsizeof(drm_amdgpu_gem_vm_entry) is 32 bytes, a large num_entries\nproduces an allocation exceeding INT_MAX, triggering\nWARNING in __kvmalloc_node_noprof(), causing a kernel WARNING,\nTAINT_WARN, and panic on CONFIG_PANIC_ON_WARN=y systems.\n\nAdd a size bounds check before we invoke the kvzalloc() to\nreject oversized num_entries early with -EINVAL.\n\n(cherry picked from commit 1fe7bf5457f6efd7be60b17e23163ba54341d73d)"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/967a00b8e06a7734aded23861faba9ee2462be87"
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        {
          "url": "https://git.kernel.org/stable/c/a1ba4594232c87c3b8defd6f89a2e40f8b08395d"
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  "cveMetadata": {
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    "cveId": "CVE-2026-63878",
    "datePublished": "2026-07-19T14:54:50.977Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
    "dateUpdated": "2026-07-19T14:54:50.977Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
      "epss": "0.00206",
      "percentile": "0.11057"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO\n\nkvcalloc(args-\u003enum_entries, sizeof(*vm_entries), GFP_KERNEL) at\namdgpu_gem.c:1050 uses the user-supplied num_entries directly without\nany upper bounds check. Since num_entries is a __u32 and\nsizeof(drm_amdgpu_gem_vm_entry) is 32 bytes, a large num_entries\nproduces an allocation exceeding INT_MAX, triggering\nWARNING in __kvmalloc_node_noprof(), causing a kernel WARNING,\nTAINT_WARN, and panic on CONFIG_PANIC_ON_WARN=y systems.\n\nAdd a size bounds check before we invoke the kvzalloc() to\nreject oversized num_entries early with -EINVAL.\n\n(cherry picked from commit 1fe7bf5457f6efd7be60b17e23163ba54341d73d)"
          }
        ],
        "id": "CVE-2026-63878",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {},
        "published": "2026-07-19T16:17:04.800",
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      "cve": "CVE-2026-63878",
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      "product_status:known_affected": "198",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO",
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      "cve": "CVE-2026-63878",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63878",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63878.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.