CVE-2024-26874

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1:\nmtk_drm_crtc_atomic_begin()\nmtk_crtc->event is not null,\n step 1:\n mtk_drm_crtc_atomic_flush:\n mtk_drm_crtc_update_config(\n !!mtk_crtc->event)\nstep 2:\nmtk_crtc_ddp_irq ->\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc->event 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 ->\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's more\nefficient to just check if mtk_crtc->event is null before use."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/mediatek/mtk_drm_crtc.c"], "versions": [{"version": "119f5173628aa7a0c3cf9db83460d40709e8241d", "lessThan": "accdac6b71d5a2b84040c3d2234f53a60edc398e", "status": "affected", "versionType": "git"}, {"version": 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->\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc->event 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 ->\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's more\nefficient to just check if mtk_crtc->event 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"}, "dataVersion": "5.1"}

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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's possible that mtk_crtc->event is NULL in\nmtk_drm_crtc_finish_page_flip().\n\npending_needs_vblank value is set by mtk_crtc->event, but in\nmtk_drm_crtc_atomic_flush(), it's 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->event is not null,\n step 1:\n mtk_drm_crtc_atomic_flush:\n mtk_drm_crtc_update_config(\n !!mtk_crtc->event)\nstep 2:\nmtk_crtc_ddp_irq ->\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc->event 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 ->\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's more\nefficient to just check if mtk_crtc->event 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->event sea NULL en mtk_drm_crtc_finish_page_flip(). El valor pendiente_needs_vblank lo establece mtk_crtc->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->event is not null, paso 1: mtk_drm_crtc_atomic_flush: mtk_drm_crtc_update_config( !!mtk_crtc->event) paso 2: mtk_crtc_ddp_irq -> mtk_drm_finish _page_flip: bloquear mtk_crtc->evento establecido en nulo, pendiente_needs_vblank configurado en falso desbloqueo pendiente_needs_vblank configurado en verdadero, paso 2: mtk_crtc_ddp_irq -> 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->even t es nulo antes de su uso."}], "id": "CVE-2024-26874", "lastModified": "2026-06-17T07:18:34.007", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26874", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-23T14:01:58.775611Z", "version": "2.0.3"}}]}, "published": "2024-04-17T11:15:09.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip", "id": "2275703", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275703"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip\nIt's possible that mtk_crtc->event is NULL in\nmtk_drm_crtc_finish_page_flip().\npending_needs_vblank value is set by mtk_crtc->event, but in\nmtk_drm_crtc_atomic_flush(), it's is not guarded by the same\nlock in mtk_drm_finish_page_flip(), thus a race condition happens.\nConsider the following case:\nCPU1 CPU2\nstep 1:\nmtk_drm_crtc_atomic_begin()\nmtk_crtc->event is not null,\nstep 1:\nmtk_drm_crtc_atomic_flush:\nmtk_drm_crtc_update_config(\n!!mtk_crtc->event)\nstep 2:\nmtk_crtc_ddp_irq ->\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc->event set to null,\npending_needs_vblank set to false\nunlock\npending_needs_vblank set to true,\nstep 2:\nmtk_crtc_ddp_irq ->\nmtk_drm_finish_page_flip called again,\npending_needs_vblank is still true\n//null pointer\nInstead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more\nefficient to just check if mtk_crtc->event is null before use."], "name": "CVE-2024-26874", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26874\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26874\nhttps://lore.kernel.org/linux-cve-announce/2024041739-CVE-2024-26874-79b0@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-13T21:06:43.196984+00:00", "updated": "2025-07-13T21:06:43.197037+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}