CVE-2024-26874 (GCVE-0-2024-26874)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-05-11 20:05
VLAI
Title
drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < accdac6b71d5a2b84040c3d2234f53a60edc398e (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < dfde84cc6c589f2a9f820f12426d97365670b731 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < 4688be96d20ffa49d2186523ee84f475f316fd49 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < 9beec711a17245b853d64488fd5b739031612340 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < d2bd30c710475b2e29288827d2c91f9e6e2b91d7 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < a3dd12b64ae8373a41a216a0b621df224210860a (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < 9acee29a38b4d4b70f1f583e5ef9a245db4db710 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < 3fc88b246a2fc16014e374040fc15af1d3752535 (git)
Affected: 119f5173628aa7a0c3cf9db83460d40709e8241d , < c958e86e9cc1b48cac004a6e245154dfba8e163b (git)
Create a notification for this product.
Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 4.19.311 , ≤ 4.19.* (semver)
Unaffected: 5.4.273 , ≤ 5.4.* (semver)
Unaffected: 5.10.214 , ≤ 5.10.* (semver)
Unaffected: 5.15.153 , ≤ 5.15.* (semver)
Unaffected: 6.1.83 , ≤ 6.1.* (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26874\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T11:15:09.670\",\"lastModified\":\"2025-03-04T15:53:06.773\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.7\",\"versionEndExcluding\":\"4.19.311\",\"matchCriteriaId\":\"509332FF-4BEC-4FD0-962A-A4351C2362C6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.273\",\"matchCriteriaId\":\"620FD8B7-BF03-43E0-951A-0A58461D4C55\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.214\",\"matchCriteriaId\":\"65987874-467B-4D3B-91D6-68A129B34FB8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.153\",\"matchCriteriaId\":\"ACB69438-845D-4E3C-B114-3140611F9C0B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.83\",\"matchCriteriaId\":\"121A07F6-F505-4C47-86BF-9BB6CC7B6C19\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.23\",\"matchCriteriaId\":\"E00814DC-0BA7-431A-9926-80FEB4A96C68\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.11\",\"matchCriteriaId\":\"9B95D3A6-E162-47D5-ABFC-F3FA74FA7CFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.8\",\"versionEndExcluding\":\"6.8.2\",\"matchCriteriaId\":\"543A75FF-25B8-4046-A514-1EA8EDD87AB1\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Mailing 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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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:17:23.474Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26874\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:17:23.474Z\", \"dateReserved\": \"2024-02-19T14:20:24.185Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:33.278Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.