CVE-2026-64008 (GCVE-0-2026-64008)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:38
VLAI
Title
accel/rocket: fix UAF via dangling GEM handle in create_bo
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/rocket: fix UAF via dangling GEM handle in create_bo rocket_ioctl_create_bo() inserts a GEM handle into the file's IDR via drm_gem_handle_create() early on, then performs several operations that can fail (sgt allocation, drm_mm insert, iommu_map). If any fail after the handle is live, the error path calls drm_gem_shmem_object_free() which kfree's the object without removing the handle from the IDR. This leaves a dangling handle pointing to freed slab memory. Any subsequent ioctl using that handle (PREP_BO, FINI_BO, SUBMIT) calls drm_gem_object_lookup() and dereferences freed memory (UAF). Fix by moving drm_gem_handle_create() to after all fallible operations succeed, matching the pattern used by panfrost, lima, and etnaviv. Also fix drm_mm_insert_node_generic() whose return value was silently overwritten by iommu_map_sgtable() on the next line. Add the missing error check. [tomeu: Move handle creation to the very end]
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: 658ebeac33517bd3169d4b65ed801e9065d0211a , < 18abd88d19ea195e2e1547fca0970c2f91d77a42 (git)
Affected: 658ebeac33517bd3169d4b65ed801e9065d0211a , < 451f1ccbbdb7b65021646704b15902655f8d228a (git)
Affected: 658ebeac33517bd3169d4b65ed801e9065d0211a , < f706e6a4ce75585af979aec3dcbdce68bc76306b (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/rocket/rocket_gem.c"
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          "vendor": "Linux",
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              "version": "0",
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              "versionType": "semver"
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              "versionType": "semver"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: fix UAF via dangling GEM handle in create_bo\n\nrocket_ioctl_create_bo() inserts a GEM handle into the file\u0027s IDR via\ndrm_gem_handle_create() early on, then performs several operations that\ncan fail (sgt allocation, drm_mm insert, iommu_map). If any fail after\nthe handle is live, the error path calls drm_gem_shmem_object_free()\nwhich kfree\u0027s the object without removing the handle from the IDR.\n\nThis leaves a dangling handle pointing to freed slab memory. Any\nsubsequent ioctl using that handle (PREP_BO, FINI_BO, SUBMIT) calls\ndrm_gem_object_lookup() and dereferences freed memory (UAF).\n\nFix by moving drm_gem_handle_create() to after all fallible operations\nsucceed, matching the pattern used by panfrost, lima, and etnaviv.\n\nAlso fix drm_mm_insert_node_generic() whose return value was silently\noverwritten by iommu_map_sgtable() on the next line. Add the missing\nerror check.\n\n[tomeu: Move handle creation to the very end]"
        }
      ],
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The bug is reached only through DRM ioctls on the local /dev/accel/accel* character device; there is no network, adjacent-wireless, or physical bus path to rocket_ioctl_create_bo().\nAC:L - An attacker fully controls both steps\u2014forcing CREATE_BO to fail after handle insertion (e.g., by exhausting the per-fd IOMMU drm_mm aperture or triggering sgt/iommu_map errors) and then issuing PREP_BO/FINI_BO/SUBMIT with the returned dangling handle\u2014without depending on external timing or victim state.\nPR:L - All rocket ioctls are registered with DRM_IOCTL_DEF_DRV flags 0 (no DRM_ROOT_ONLY/DRM_AUTH/DRM_MASTER), requiring only the ability to open the accel device node, which is standard unprivileged local access on RK3588 edge-AI/embedded systems running ML workloads.\nUI:N - Exploitation requires no action from a separate victim; the attacker creates the dangling handle and triggers the UAF through their own ioctl sequence on a device they opened.\nS:U - Impact is kernel heap UAF leading to local privilege escalation or crash within the same kernel security authority; it is not a VM escape, IOMMU DMA-boundary bypass, or cross-hypervisor attack.\nC:H - The dangling GEM handle causes use-after-free of a kmalloc\u0027d rocket_gem_object; subsequent lookups dereference freed slab memory (resv, sgt, mm node fields), enabling arbitrary kernel memory read via heap grooming.\nI:H - UAF on the GEM object structure allows heap spraying to corrupt kernel metadata and control flow; the SUBMIT ioctl path further processes corrupted BO pointers for NPU job scheduling, supporting arbitrary write and code execution primitives.\nA:H - UAF dereferences in PREP_BO/FINI_BO/SUBMIT reliably cause kernel oops/panic, and the dangling-handle condition is repeatable for sustained denial of service."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:08.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/18abd88d19ea195e2e1547fca0970c2f91d77a42"
        },
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          "url": "https://git.kernel.org/stable/c/451f1ccbbdb7b65021646704b15902655f8d228a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f706e6a4ce75585af979aec3dcbdce68bc76306b"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64008",
    "datePublished": "2026-07-19T14:56:23.746Z",
    "dateReserved": "2026-07-19T07:54:57.026Z",
    "dateUpdated": "2026-08-05T12:38:08.050Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: fix UAF via dangling GEM handle in create_bo\n\nrocket_ioctl_create_bo() inserts a GEM handle into the file\u0027s IDR via\ndrm_gem_handle_create() early on, then performs several operations that\ncan fail (sgt allocation, drm_mm insert, iommu_map). If any fail after\nthe handle is live, the error path calls drm_gem_shmem_object_free()\nwhich kfree\u0027s the object without removing the handle from the IDR.\n\nThis leaves a dangling handle pointing to freed slab memory. Any\nsubsequent ioctl using that handle (PREP_BO, FINI_BO, SUBMIT) calls\ndrm_gem_object_lookup() and dereferences freed memory (UAF).\n\nFix by moving drm_gem_handle_create() to after all fallible operations\nsucceed, matching the pattern used by panfrost, lima, and etnaviv.\n\nAlso fix drm_mm_insert_node_generic() whose return value was silently\noverwritten by iommu_map_sgtable() on the next line. Add the missing\nerror check.\n\n[tomeu: Move handle creation to the very end]"
          }
        ],
        "id": "CVE-2026-64008",
        "lastModified": "2026-07-30T14:59:47.950",
        "metrics": {
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                "scope": "UNCHANGED",
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        "vulnStatus": "Awaiting Analysis"
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-05T14:19:06+00:00",
      "cve": "CVE-2026-64008",
      "id": "CVE-2026-64008",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/rocket: fix UAF via dangling GEM handle in create_bo",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64008.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-06T01:10:27Z",
      "cve": "CVE-2026-64008",
      "id": "CVE-2026-64008",
      "initial_release_date": "2026-07-21T13:01:39Z",
      "product_status:known_not_affected": "298",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64008",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64008.json",
      "version": "3"
    }
  }
}



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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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