CVE-2026-72093 (GCVE-0-2026-72093)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40
VLAI
Title
accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap() When vm_insert_pages() fails, the error path calls vma->vm_ops->close(vma) which internally calls drm_gem_vm_close() → drm_gem_object_put(), releasing the GEM object reference acquired at the start of the function. However, the close_vma label then falls through to put_obj, which calls drm_gem_object_put() a second time on the same object. If the first put releases the last reference, the object is freed and the second put accesses freed memory, causing a use-after-free. Fix by returning directly from close_vma instead of falling through to put_obj, since the close handler already performs all necessary cleanup including the object put.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 4e370b5289624f46a356dcc94f9f87025eaa6036 (git)
Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 5da885c39baa70f570a8be35a78e85a351f33918 (git)
Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 63bbf9ac5dde2ba85e7b39d0a0b7d540e6252ba4 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_gem.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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                  "versionStartIncluding": "6.16",
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()\n\nWhen vm_insert_pages() fails, the error path calls vma-\u003evm_ops-\u003eclose(vma)\nwhich internally calls drm_gem_vm_close() \u2192 drm_gem_object_put(),\nreleasing the GEM object reference acquired at the start of the function.\nHowever, the close_vma label then falls through to put_obj, which calls\ndrm_gem_object_put() a second time on the same object.\n\nIf the first put releases the last reference, the object is freed and the\nsecond put accesses freed memory, causing a use-after-free.\n\nFix by returning directly from close_vma instead of falling through to\nput_obj, since the close handler already performs all necessary cleanup\nincluding the object put."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local DRM ioctls (AMDXDNA_CREATE_BO, PRIME_HANDLE_TO_FD, GEM_CLOSE) and mmap() on the exported dma-buf fd through /dev/accel/accel*; amdxdna_gem_dmabuf_mmap() has no network, adjacent-radio, or physical-bus entry point.\nAC:L - After exporting a BO and closing its GEM handle (leaving only the dma-buf ref), the vm_insert_pages() error path deterministically double-puts the object; the attacker can force insert failure via RLIMIT_AS/cgroup memory pressure without uncontrollable races or victim-specific state.\nPR:L - CREATE_BO and PRIME ioctls are registered without DRM_ROOT_ONLY/AUTH; any unprivileged local user permitted to open the AMD XDNA accel node (typically render/video group on Ryzen AI systems) can create, export, and mmap buffers without real root or init-namespace capabilities.\nUI:N - The attacker opens the accel device, creates and exports a buffer, closes the handle, and mmap()s the dma-buf fd in their own process; no separate victim mount, file open, or other user interaction is required.\nS:U - The double drm_gem_object_put() use-after-free corrupts kernel slab metadata within the same kernel security authority; it is not a VM escape, hypervisor breakout, or IOMMU DMA-boundary bypass as a direct consequence of this refcount bug.\nC:H - UAF on the freed drm_gem_object during the second drm_gem_object_put() lets an attacker reclaim slab objects via heap grooming, enabling arbitrary kernel memory disclosure beyond a bounded metadata leak.\nI:H - The erroneous second put on a freed GEM object provides slab corruption primitives that can be developed into arbitrary kernel writes and local privilege escalation, not merely limited data modification.\nA:H - The use-after-free in drm_gem_object_put() dereferences freed kmem and can immediately provoke kernel oops/panic; repeated triggering sustains denial of service on the NPU host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:40:11.291Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4e370b5289624f46a356dcc94f9f87025eaa6036"
        },
        {
          "url": "https://git.kernel.org/stable/c/5da885c39baa70f570a8be35a78e85a351f33918"
        },
        {
          "url": "https://git.kernel.org/stable/c/63bbf9ac5dde2ba85e7b39d0a0b7d540e6252ba4"
        }
      ],
      "title": "accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72093",
    "datePublished": "2026-08-15T05:52:39.865Z",
    "dateReserved": "2026-08-09T03:40:39.905Z",
    "dateUpdated": "2026-08-17T05:40:11.291Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.06563"
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                "programFiles": [
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        "cveTags": [],
        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()\n\nWhen vm_insert_pages() fails, the error path calls vma-\u003evm_ops-\u003eclose(vma)\nwhich internally calls drm_gem_vm_close() \u2192 drm_gem_object_put(),\nreleasing the GEM object reference acquired at the start of the function.\nHowever, the close_vma label then falls through to put_obj, which calls\ndrm_gem_object_put() a second time on the same object.\n\nIf the first put releases the last reference, the object is freed and the\nsecond put accesses freed memory, causing a use-after-free.\n\nFix by returning directly from close_vma instead of falling through to\nput_obj, since the close handler already performs all necessary cleanup\nincluding the object put."
          }
        ],
        "id": "CVE-2026-72093",
        "lastModified": "2026-08-17T06:18:08.220",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
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                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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        "vulnStatus": "Received"
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T21:48:07+00:00",
      "cve": "CVE-2026-72093",
      "id": "CVE-2026-72093",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72093.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:40:56Z",
      "cve": "CVE-2026-72093",
      "id": "CVE-2026-72093",
      "initial_release_date": "2026-08-28T16:40:56Z",
      "product_status:known_not_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72093",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72093.json",
      "version": "2"
    }
  }
}



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