Vulnerability-Lookup

GHSA-5CM7-74MX-P47M

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-98949"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:16Z",
    "severity": null
  },
  "details": "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": "GHSA-5cm7-74mx-p47m",
  "modified": "2026-10-23T15:31:32Z",
  "published": "2026-10-23T15:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98949"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98949 (GCVE-0-2026-98949)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-23 12:19

Title

drm/imagination: Fix reference and vm_bo handling in remap()

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.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/521cf8403a185a9d5…
https://git.kernel.org/stable/c/9caa2eca5cc837251…
https://git.kernel.org/stable/c/784356aa88b82035d…
https://git.kernel.org/stable/c/196d4d10c1b33ae17…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ff5f643de0bf27874c4033cd57a0bd034b5c7d11 , < 521cf8403a185a9d5790fe324bb43ba7ea85f51c (git) Affected: ff5f643de0bf27874c4033cd57a0bd034b5c7d11 , < 9caa2eca5cc8372517ff36a83f321d4326abae93 (git) Affected: ff5f643de0bf27874c4033cd57a0bd034b5c7d11 , < 784356aa88b82035d70e9faeded49b70cddeb29e (git) Affected: ff5f643de0bf27874c4033cd57a0bd034b5c7d11 , < 196d4d10c1b33ae176685ff42a9994a5952b1d0f (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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",
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:19:08.946Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/521cf8403a185a9d5790fe324bb43ba7ea85f51c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9caa2eca5cc8372517ff36a83f321d4326abae93"
        },
        {
          "url": "https://git.kernel.org/stable/c/784356aa88b82035d70e9faeded49b70cddeb29e"
        },
        {
          "url": "https://git.kernel.org/stable/c/196d4d10c1b33ae176685ff42a9994a5952b1d0f"
        }
      ],
      "title": "drm/imagination: Fix reference and vm_bo handling in remap()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98949",
    "datePublished": "2026-10-23T12:19:08.946Z",
    "dateReserved": "2026-09-25T10:25:14.382Z",
    "dateUpdated": "2026-10-23T12:19:08.946Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted