CVE-2026-68260 (GCVE-0-2026-68260)
Vulnerability from cvelistv5
Published
2026-08-10 12:01
Modified
2026-08-17 05:01
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: acquire vm_ctx->lock before mapping memory to GPU VM The drm gpuvm code doesn't protect find operation against map operation, and the driver needs to ensure a map operation shouldn't happen when a find operation is in progress. In some cases a find operation will be in progress when doing map/unmap operations, and the find operation will do a NULL pointer dereference. An example of the stack trace of such NULL dereference is shown below: ``` Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000010 [<ffffffff01e989d4>] drm_gpuva_find+0x28/0x6c [drm_gpuvm] [<ffffffff01ed3a40>] pvr_vm_unmap+0x34/0x68 [powervr] [<ffffffff01ec69da>] pvr_ioctl_vm_unmap+0x2e/0x50 [powervr] [<ffffffff8080ce0a>] drm_ioctl_kernel+0x8e/0xdc [<ffffffff8080d016>] drm_ioctl+0x1be/0x3e0 [<ffffffff802bec3e>] __riscv_sys_ioctl+0xba/0xc4 [<ffffffff80d858b2>] do_trap_ecall_u+0x23e/0x3f4 [<ffffffff80d92288>] handle_exception+0x168/0x174 ``` As all occurences of drm_gpuva_find*() are already guarded by vm_ctx->lock, make pvr_vm_map() to acquire this lock to prevent disturbing any find operation. This fixes the NULL deference problem in drm_gpuva_find*().
References
Impacted products
Vendor Product Version
Linux Linux Version: ff5f643de0bf27874c4033cd57a0bd034b5c7d11
Version: ff5f643de0bf27874c4033cd57a0bd034b5c7d11
Version: ff5f643de0bf27874c4033cd57a0bd034b5c7d11
Version: ff5f643de0bf27874c4033cd57a0bd034b5c7d11
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/imagination/pvr_vm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/imagination/pvr_vm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: acquire vm_ctx-\u003elock before mapping memory to GPU VM\n\nThe drm gpuvm code doesn\u0027t protect find operation against map operation,\nand the driver needs to ensure a map operation shouldn\u0027t happen when a\nfind operation is in progress.\n\nIn some cases a find operation will be in progress when doing map/unmap\noperations, and the find operation will do a NULL pointer dereference.\n\nAn example of the stack trace of such NULL dereference is shown below:\n\n```\nUnable to handle kernel access to user memory without uaccess routines at\nvirtual address 0000000000000010\n\n[\u003cffffffff01e989d4\u003e] drm_gpuva_find+0x28/0x6c [drm_gpuvm]\n[\u003cffffffff01ed3a40\u003e] pvr_vm_unmap+0x34/0x68 [powervr]\n[\u003cffffffff01ec69da\u003e] pvr_ioctl_vm_unmap+0x2e/0x50 [powervr]\n[\u003cffffffff8080ce0a\u003e] drm_ioctl_kernel+0x8e/0xdc\n[\u003cffffffff8080d016\u003e] drm_ioctl+0x1be/0x3e0\n[\u003cffffffff802bec3e\u003e] __riscv_sys_ioctl+0xba/0xc4\n[\u003cffffffff80d858b2\u003e] do_trap_ecall_u+0x23e/0x3f4\n[\u003cffffffff80d92288\u003e] handle_exception+0x168/0x174\n```\n\nAs all occurences of drm_gpuva_find*() are already guarded by\nvm_ctx-\u003elock, make pvr_vm_map() to acquire this lock to prevent\ndisturbing any find operation. This fixes the NULL deference problem in\ndrm_gpuva_find*()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 - Triggered through the DRM_IOCTL_PVR_VM_MAP/VM_UNMAP ioctls on the PowerVR render node (/dev/dri/renderD*), which requires local access to the device file; no network or physical path exists.\nAC:L - The attacker owns both sides of the race, issuing concurrent VM_MAP and VM_UNMAP ioctls from two threads on the same fd and vm_ctx handle, and can retry indefinitely with attacker-chosen mapping layouts that force split/remap (free) paths.\nPR:L - The ioctls are marked DRM_RENDER_ALLOW, so no DRM master, root, or capability is needed; any unprivileged process able to open the render node (world-accessible or graphics-group on Android/embedded PowerVR devices) can reach the code.\nUI:N - The attacker performs the entire sequence itself by opening the render node, creating a VM context and issuing concurrent map/unmap ioctls; no victim action is involved.\nS:U - The corruption stays within the kernel\u0027s own security authority on the affected host; no VM, IOMMU or sandbox boundary is crossed by the flaw itself.\nC:H - The unlocked map path frees drm_gpuva objects via pvr_vm_gpuva_remap()/pvr_vm_gpuva_unmap() while a concurrent find returns them, yielding a use-after-free whose reclaimed contents the attacker can groom to read kernel memory; racing MMU updates can also leave GPU page tables mapping unintended pages.\nI:H - The same use-after-free plus unsynchronized rb interval-tree insert/remove gives attacker-influenced writes through a freed/corrupted structure, and the racing pvr_mmu_map/unmap operations can corrupt GPU page tables, which is leveragable into arbitrary memory modification.\nA:H - The reported failure is an immediate kernel NULL pointer dereference in drm_gpuva_find(), and tree corruption or use-after-free reliably produces oopses, and the ioctl can be re-issued to crash the system at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:01:52.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f1f2618e44b21a7d4eb30d3bbd7e015ffbbbadf"
        },
        {
          "url": "https://git.kernel.org/stable/c/6253bb56bb2ebdf317d8b599ce737a2510cc2e17"
        },
        {
          "url": "https://git.kernel.org/stable/c/15f58d44c24477a6ebffa44ec05207b81cfa55d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/17e2030f37600994440f875dc410615d5c66ee6d"
        }
      ],
      "title": "drm/imagination: acquire vm_ctx-\u003elock before mapping memory to GPU VM",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68260",
    "datePublished": "2026-08-10T12:01:34.414Z",
    "dateReserved": "2026-07-30T09:28:09.378Z",
    "dateUpdated": "2026-08-17T05:01:52.352Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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