Vulnerability-Lookup

GHSA-7JWX-FMP4-WP46

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32

Details

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

drm/rockchip: dw_dp: Switch to drmm_kzalloc()

Driver makes use of drmm_encoder_init() to initialize the encoder and automatically handle the cleanup by registering drm_encoder_cleanup() with drmm_add_action().

However, the internal structure containing the encoder part gets allocated with devm_kzalloc(), which happens while component_bind_all() is being called from Rockchip DRM driver. The component framework further ensures it is deallocated as part of releasing all the resources claimed during bind, which is triggered from component_unbind_all().

When the reference to the DRM device gets eventually dropped via drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release() attempts to access the now released encoder structure, leading to use-after-free.

Ensure driver's internal structure is still reachable on encoder cleanup by switching from a device-managed allocation to a drm-managed one.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74421"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:44Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/rockchip: dw_dp: Switch to drmm_kzalloc()\n\nDriver makes use of drmm_encoder_init() to initialize the encoder and\nautomatically handle the cleanup by registering drm_encoder_cleanup()\nwith drmm_add_action().\n\nHowever, the internal structure containing the encoder part gets\nallocated with devm_kzalloc(), which happens while component_bind_all()\nis being called from Rockchip DRM driver.  The component framework\nfurther ensures it is deallocated as part of releasing all the resources\nclaimed during bind, which is triggered from component_unbind_all().\n\nWhen the reference to the DRM device gets eventually dropped via\ndrm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release()\nattempts to access the now released encoder structure, leading to\nuse-after-free.\n\nEnsure driver\u0027s internal structure is still reachable on encoder cleanup\nby switching from a device-managed allocation to a drm-managed one.",
  "id": "GHSA-7jwx-fmp4-wp46",
  "modified": "2026-08-15T06:32:33Z",
  "published": "2026-08-15T06:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74421 (GCVE-0-2026-74421)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:19

Title

drm/rockchip: dw_dp: Switch to drmm_kzalloc()

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/rockchip: dw_dp: Switch to drmm_kzalloc() Driver makes use of drmm_encoder_init() to initialize the encoder and automatically handle the cleanup by registering drm_encoder_cleanup() with drmm_add_action(). However, the internal structure containing the encoder part gets allocated with devm_kzalloc(), which happens while component_bind_all() is being called from Rockchip DRM driver. The component framework further ensures it is deallocated as part of releasing all the resources claimed during bind, which is triggered from component_unbind_all(). When the reference to the DRM device gets eventually dropped via drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release() attempts to access the now released encoder structure, leading to use-after-free. Ensure driver's internal structure is still reachable on encoder cleanup by switching from a device-managed allocation to a drm-managed one.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/0d60b835bca42f0f7…
https://git.kernel.org/stable/c/6b0b92d1110eccccb…
https://git.kernel.org/stable/c/ed9da8d23020352ad…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d68ba7bac9555d05e2f5b310c898b2a5c7eff174 , < 0d60b835bca42f0f790689dd47819ed881a92ccc (git) Affected: d68ba7bac9555d05e2f5b310c898b2a5c7eff174 , < 6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12 (git) Affected: d68ba7bac9555d05e2f5b310c898b2a5c7eff174 , < ed9da8d23020352ad24c528db09b5acdd78b81fd (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/rockchip/dw_dp-rockchip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0d60b835bca42f0f790689dd47819ed881a92ccc",
              "status": "affected",
              "version": "d68ba7bac9555d05e2f5b310c898b2a5c7eff174",
              "versionType": "git"
            },
            {
              "lessThan": "6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12",
              "status": "affected",
              "version": "d68ba7bac9555d05e2f5b310c898b2a5c7eff174",
              "versionType": "git"
            },
            {
              "lessThan": "ed9da8d23020352ad24c528db09b5acdd78b81fd",
              "status": "affected",
              "version": "d68ba7bac9555d05e2f5b310c898b2a5c7eff174",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/rockchip/dw_dp-rockchip.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": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.18.40",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "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/rockchip: dw_dp: Switch to drmm_kzalloc()\n\nDriver makes use of drmm_encoder_init() to initialize the encoder and\nautomatically handle the cleanup by registering drm_encoder_cleanup()\nwith drmm_add_action().\n\nHowever, the internal structure containing the encoder part gets\nallocated with devm_kzalloc(), which happens while component_bind_all()\nis being called from Rockchip DRM driver.  The component framework\nfurther ensures it is deallocated as part of releasing all the resources\nclaimed during bind, which is triggered from component_unbind_all().\n\nWhen the reference to the DRM device gets eventually dropped via\ndrm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release()\nattempts to access the now released encoder structure, leading to\nuse-after-free.\n\nEnsure driver\u0027s internal structure is still reachable on encoder cleanup\nby switching from a device-managed allocation to a drm-managed one."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:19:06.310Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd"
        }
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      "title": "drm/rockchip: dw_dp: Switch to drmm_kzalloc()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74421",
    "datePublished": "2026-08-15T05:59:25.328Z",
    "dateReserved": "2026-08-15T05:44:03.894Z",
    "dateUpdated": "2026-08-17T05:19:06.310Z",
    "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.

Detection rules are retrieved from Rulezet.

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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