Vulnerability-Lookup

GHSA-9858-6444-XRJW

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/msm/dpu: don't mix devm and drmm functions

Mixing devm and drmm functions will result in a use-after-free on msm driver teardown if userspace keeps a reference on the drm device: The WB connector data will be destroyed because of the use of devm_kzalloc()), while the usersoace still can try interacting with the WB connector (which uses drmm_ functions).

Change dpu_writeback_init() to use drmm_.

Patchwork: https://patchwork.freedesktop.org/patch/722656/

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64050"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:45Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dpu: don\u0027t mix devm and drmm functions\n\nMixing devm and drmm functions will result in a use-after-free on msm\ndriver teardown if userspace keeps a reference on the drm device:\nThe WB connector data will be destroyed because of the use of\ndevm_kzalloc()), while the usersoace still can try interacting with the\nWB connector (which uses drmm_ functions).\n\nChange dpu_writeback_init() to use drmm_.\n\nPatchwork: https://patchwork.freedesktop.org/patch/722656/",
  "id": "GHSA-9858-6444-xrjw",
  "modified": "2026-07-20T15:31:57Z",
  "published": "2026-07-19T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64050"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95048a12f48c627bc2ccc4d84f87640630ba2bdb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0c70a11365cba7fba25a77463582bcec0f7846e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff58e5ef1b46ce614af048d2d04986df05ffab90"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64050 (GCVE-0-2026-64050)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38

Title

drm/msm/dpu: don't mix devm and drmm functions

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/msm/dpu: don't mix devm and drmm functions Mixing devm and drmm functions will result in a use-after-free on msm driver teardown if userspace keeps a reference on the drm device: The WB connector data will be destroyed because of the use of devm_kzalloc()), while the usersoace still can try interacting with the WB connector (which uses drmm_ functions). Change dpu_writeback_init() to use drmm_. Patchwork: https://patchwork.freedesktop.org/patch/722656/

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ff58e5ef1b46ce614…
https://git.kernel.org/stable/c/95048a12f48c627bc…
https://git.kernel.org/stable/c/c0c70a11365cba7fb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b , < ff58e5ef1b46ce614af048d2d04986df05ffab90 (git) Affected: 0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b , < 95048a12f48c627bc2ccc4d84f87640630ba2bdb (git) Affected: 0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b , < c0c70a11365cba7fba25a77463582bcec0f7846e (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ff58e5ef1b46ce614af048d2d04986df05ffab90",
              "status": "affected",
              "version": "0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b",
              "versionType": "git"
            },
            {
              "lessThan": "95048a12f48c627bc2ccc4d84f87640630ba2bdb",
              "status": "affected",
              "version": "0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b",
              "versionType": "git"
            },
            {
              "lessThan": "c0c70a11365cba7fba25a77463582bcec0f7846e",
              "status": "affected",
              "version": "0b37ac63fc9db7779168ad18d7e6e8ab9df6a40b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dpu: don\u0027t mix devm and drmm functions\n\nMixing devm and drmm functions will result in a use-after-free on msm\ndriver teardown if userspace keeps a reference on the drm device:\nThe WB connector data will be destroyed because of the use of\ndevm_kzalloc()), while the usersoace still can try interacting with the\nWB connector (which uses drmm_ functions).\n\nChange dpu_writeback_init() to use drmm_.\n\nPatchwork: https://patchwork.freedesktop.org/patch/722656/"
        }
      ],
      "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 - The bug is reachable only through local DRM character device ioctls on /dev/dri/card0 during driver teardown, not via any network protocol or physical bus.\nAC:L - An attacker who keeps a DRM file descriptor open controls the userspace side of the race and can repeatedly issue ioctls during the teardown window; UAF exploitation does not depend on winning a race the attacker cannot influence.\nPR:L - Exploitation requires only local access to the primary DRM device node (typically membership in the video/render group on Linux); no real root or init-namespace capabilities are needed to hold the fd and trigger UAF via connector query ioctls.\nUI:N - No victim interaction is required beyond the attacker maintaining their own open DRM file descriptor during driver unload or unbind.\nS:U - The vulnerability causes kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a cross-boundary escape such as VM or IOMMU bypass.\nC:H - Use-after-free of the dpu_wb_connector structure allows reading freed slab memory and can be leveraged for arbitrary kernel memory disclosure through heap grooming.\nI:H - UAF corruption of connector private data and the wb_enc pointer can be turned into arbitrary kernel writes or code execution, and the writeback path can program display hardware DMA to attacker-influenced addresses.\nA:H - Dereferencing the freed dpu_wb_connector during ioctl handling can cause kernel oops or panic, and UAF exploitation attempts reliably threaten system availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:41.459Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ff58e5ef1b46ce614af048d2d04986df05ffab90"
        },
        {
          "url": "https://git.kernel.org/stable/c/95048a12f48c627bc2ccc4d84f87640630ba2bdb"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0c70a11365cba7fba25a77463582bcec0f7846e"
        }
      ],
      "title": "drm/msm/dpu: don\u0027t mix devm and drmm functions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64050",
    "datePublished": "2026-07-19T15:39:33.942Z",
    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-08-05T12:38:41.459Z",
    "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.

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.
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GHSA-9858-6444-XRJW

CVE-2026-64050 (GCVE-0-2026-64050)

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