fkie_cve-2024-26874
Vulnerability from fkie_nvd
Published
2024-04-17 11:15
Modified
2025-03-04 15:53
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip It's possible that mtk_crtc->event is NULL in mtk_drm_crtc_finish_page_flip(). pending_needs_vblank value is set by mtk_crtc->event, but in mtk_drm_crtc_atomic_flush(), it's is not guarded by the same lock in mtk_drm_finish_page_flip(), thus a race condition happens. Consider the following case: CPU1 CPU2 step 1: mtk_drm_crtc_atomic_begin() mtk_crtc->event is not null, step 1: mtk_drm_crtc_atomic_flush: mtk_drm_crtc_update_config( !!mtk_crtc->event) step 2: mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip: lock mtk_crtc->event set to null, pending_needs_vblank set to false unlock pending_needs_vblank set to true, step 2: mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip called again, pending_needs_vblank is still true //null pointer Instead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more efficient to just check if mtk_crtc->event is null before use.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860aPatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398ePatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163bPatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860aPatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398ePatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163bPatch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731Patch, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 10.0


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip\n\nIt\u0027s possible that mtk_crtc-\u003eevent is NULL in\nmtk_drm_crtc_finish_page_flip().\n\npending_needs_vblank value is set by mtk_crtc-\u003eevent, but in\nmtk_drm_crtc_atomic_flush(), it\u0027s is not guarded by the same\nlock in mtk_drm_finish_page_flip(), thus a race condition happens.\n\nConsider the following case:\n\nCPU1                              CPU2\nstep 1:\nmtk_drm_crtc_atomic_begin()\nmtk_crtc-\u003eevent is not null,\n                                  step 1:\n                                  mtk_drm_crtc_atomic_flush:\n                                  mtk_drm_crtc_update_config(\n                                      !!mtk_crtc-\u003eevent)\nstep 2:\nmtk_crtc_ddp_irq -\u003e\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc-\u003eevent set to null,\npending_needs_vblank set to false\nunlock\n                                  pending_needs_vblank set to true,\n\n                                  step 2:\n                                  mtk_crtc_ddp_irq -\u003e\n                                  mtk_drm_finish_page_flip called again,\n                                  pending_needs_vblank is still true\n                                  //null pointer\n\nInstead of guarding the entire mtk_drm_crtc_atomic_flush(), it\u0027s more\nefficient to just check if mtk_crtc-\u003eevent is null before use."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/mediatek: corrige un fallo del puntero nulo en mtk_drm_crtc_finish_page_flip Es posible que mtk_crtc-\u0026gt;event sea NULL en mtk_drm_crtc_finish_page_flip(). El valor pendiente_needs_vblank lo establece mtk_crtc-\u0026gt;event, pero en mtk_drm_crtc_atomic_flush(), no est\u00e1 protegido por el mismo bloqueo en mtk_drm_finish_page_flip(), por lo que ocurre una condici\u00f3n de carrera. Considere el siguiente caso: CPU1 CPU2 paso 1: mtk_drm_crtc_atomic_begin() mtk_crtc-\u0026gt;event is not null, paso 1: mtk_drm_crtc_atomic_flush: mtk_drm_crtc_update_config( !!mtk_crtc-\u0026gt;event) paso 2: mtk_crtc_ddp_irq -\u0026gt; mtk_drm_finish _page_flip: bloquear mtk_crtc-\u0026gt;evento establecido en nulo, pendiente_needs_vblank configurado en falso desbloqueo pendiente_needs_vblank configurado en verdadero, paso 2: mtk_crtc_ddp_irq -\u0026gt; mtk_drm_finish_page_flip llamado nuevamente, pendiente_needs_vblank sigue siendo verdadero //puntero nulo En lugar de proteger todo el mtk_drm_crtc_atomic_flush(), es m\u00e1s eficiente simplemente verificar si mtk_crtc-\u0026gt;even t es nulo antes de su uso."
    }
  ],
  "id": "CVE-2024-26874",
  "lastModified": "2025-03-04T15:53:06.773",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-04-17T11:15:09.670",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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