FKIE_CVE-2026-98949

Vulnerability from fkie_nvd - Published: 2026-10-23 13:17 - Updated: 2026-10-23 13:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Fix reference and vm_bo handling in remap() When a map overlaps part of an existing mapping, pvr_vm_gpuva_remap() splits the mapping into prev/next parts covering what the request did not take, instead of creating something new. It gets two things wrong. - A GEM reference is taken for each part but it's never needed and never dropped, so it leaks one reference per split (remap-next-in-2m in tests/imagination/pvr_vm_map.c): CRITICAL: 33558528 bytes of shmem still held after close - The parts still belong to the original object being split, but pvr_vm_gpuva_remap() links them to ctx->gpuvm_bo, the new object's vm_bo: prev_va --obj--> BO_A BO_B <--obj-- vm_bo (ctx->gpuvm_bo) \___________link___________/ (mismatch: BO_A != BO_B) drm_gpuva_link() catches the mismatch: WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310 drm_WARN_ON(obj != vm_bo->obj) Call trace: drm_gpuva_link pvr_vm_gpuva_remap __drm_gpuvm_sm_map pvr_vm_map pvr_ioctl_vm_map Link them to op->remap.unmap->va->vm_bo instead. The locking of the GPUVA lists of the other objects touched by a split is not addressed here; it is handled by switching the GPUVM to immediate mode.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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",
          "versions": [
            {
              "lessThan": "521cf8403a185a9d5790fe324bb43ba7ea85f51c",
              "status": "affected",
              "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
              "versionType": "git"
            },
            {
              "lessThan": "9caa2eca5cc8372517ff36a83f321d4326abae93",
              "status": "affected",
              "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
              "versionType": "git"
            },
            {
              "lessThan": "784356aa88b82035d70e9faeded49b70cddeb29e",
              "status": "affected",
              "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
              "versionType": "git"
            },
            {
              "lessThan": "196d4d10c1b33ae176685ff42a9994a5952b1d0f",
              "status": "affected",
              "version": "ff5f643de0bf27874c4033cd57a0bd034b5c7d11",
              "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": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/imagination: Fix reference and vm_bo handling in remap()\n\nWhen a map overlaps part of an existing mapping, pvr_vm_gpuva_remap()\nsplits the mapping into prev/next parts covering what the request did\nnot take, instead of creating something new. It gets two things wrong.\n\n- A GEM reference is taken for each part but it\u0027s never needed and never\n  dropped, so it leaks one reference per split (remap-next-in-2m in\n  tests/imagination/pvr_vm_map.c):\n\n    CRITICAL: 33558528 bytes of shmem still held after close\n\n- The parts still belong to the original object being split, but\n  pvr_vm_gpuva_remap() links them to ctx-\u003egpuvm_bo, the new object\u0027s\n  vm_bo:\n\n    prev_va --obj--\u003e BO_A          BO_B \u003c--obj-- vm_bo (ctx-\u003egpuvm_bo)\n            \\___________link___________/  (mismatch: BO_A != BO_B)\n\n  drm_gpuva_link() catches the mismatch:\n\n    WARNING: drivers/gpu/drm/drm_gpuvm.c:2108 at drm_gpuva_link+0x2ec/0x310\n      drm_WARN_ON(obj != vm_bo-\u003eobj)\n    Call trace:\n     drm_gpuva_link\n     pvr_vm_gpuva_remap\n     __drm_gpuvm_sm_map\n     pvr_vm_map\n     pvr_ioctl_vm_map\n\n  Link them to op-\u003eremap.unmap-\u003eva-\u003evm_bo instead.\n\nThe locking of the GPUVA lists of the other objects touched by a split is\nnot addressed here; it is handled by switching the GPUVM to immediate\nmode."
    }
  ],
  "id": "CVE-2026-98949",
  "lastModified": "2026-10-23T13:17:16.037",
  "metrics": {},
  "published": "2026-10-23T13:17:16.037",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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