CVE-2026-46276

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When the size is zero,\namdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(),\nwhich calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires\nDRM_MM_BUG_ON(start + size <= start) -- trivially true when size is\nzero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT.\n\nGuard against this by returning 0 early from\namdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM\nresource manager registration for hardware resources that are absent,\nwithout affecting any other GPU type.\n\nDRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in\nthe kernel config. This is apparently rarely enabled as these chips\nhave been in the market for over a year and this issue was only reported\nnow.\n\nOops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c"], "versions": [{"version": "c832c346cdf9022872655be621880e0f66f4135d", "lessThan": "1f5d33e7b0a9a2a140f46e22fb52eede323c5946", "status": "affected", "versionType": "git"}, {"version": "c832c346cdf9022872655be621880e0f66f4135d", "lessThan": "9bc925759c05feae7dfa9570e77131d54729c8ea", "status": "affected", "versionType": "git"}, {"version": "c832c346cdf9022872655be621880e0f66f4135d", "lessThan": "36f9602fb22ede69fcc8b422be0cf8105bf655ad", "status": "affected", "versionType": "git"}, 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The gfx_v12_0 initialisation code correctly leaves\nadev->gds.gds_size, adev->gds.gws_size, and adev->gds.oa_size at\nzero to reflect this.\n\namdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for\neach of these resources regardless of size. When the size is zero,\namdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(),\nwhich calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires\nDRM_MM_BUG_ON(start + size <= start) -- trivially true when size is\nzero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT.\n\nGuard against this by returning 0 early from\namdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM\nresource manager registration for hardware resources that are absent,\nwithout affecting any other GPU type.\n\nDRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in\nthe kernel config. This is apparently rarely enabled as these chips\nhave been in the market for over a year and this issue was only reported\nnow.\n\nOops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amdgpu: corrige la inicializaci\u00f3n de rango GDS de tama\u00f1o cero en RDNA4\n\nEl hardware RDNA4 (GFX 12) elimina los recursos de memoria en chip GDS, GWS y OA. El c\u00f3digo de inicializaci\u00f3n gfx_v12_0 deja correctamente adev->gds.gds_size, adev->gds.gws_size y adev->gds.oa_size en cero para reflejar esto.\n\namdgpu_ttm_init() llama incondicionalmente a amdgpu_ttm_init_on_chip() para cada uno de estos recursos, independientemente del tama\u00f1o. Cuando el tama\u00f1o es cero, amdgpu_ttm_init_on_chip() reenv\u00eda la llamada a ttm_range_man_init(), que llama a drm_mm_init(mm, 0, 0). drm_mm_init() dispara inmediatamente DRM_MM_BUG_ON(start + size <= start) -- trivialmente cierto cuando el tama\u00f1o es cero -- lo que provoca el fallo del kernel durante el modprobe de amdgpu en una RX 9070 XT.\n\nSe evita esto devolviendo 0 anticipadamente desde amdgpu_ttm_init_on_chip() cuando size_in_page es cero. Esto omite el registro del gestor de recursos TTM para los recursos de hardware que est\u00e1n ausentes, sin afectar a ning\u00fan otro tipo de GPU.\n\nDRM_MM_BUG_ON() solo se activa si CONFIG_DRM_DEBUG_MM est\u00e1 habilitado en la configuraci\u00f3n del kernel. Esto aparentemente rara vez est\u00e1 habilitado, ya que estos chips han estado en el mercado durante m\u00e1s de un a\u00f1o y este problema solo se inform\u00f3 ahora.\n\nAn\u00e1lisis de Oops: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(seleccionado de la confirmaci\u00f3n 5719ce5865279cad4fd5f01011fe037168503f2d)"}], "id": "CVE-2026-46276", "lastModified": "2026-11-06T17:17:54.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46276", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:13:14.841471Z", "version": "2.0.3"}}]}, "published": "2026-06-08T17:16:45.103", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/095a8b0ad3c3b5cdc3850d961adb8a8f735220bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e21db1a77967bc15df662efdca8ea8a61d124ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f5d33e7b0a9a2a140f46e22fb52eede323c5946"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30c000a49094ec568c9b51b7421f7a4a3f0b0298"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36f9602fb22ede69fcc8b422be0cf8105bf655ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e26c76891ab99fa173e9c501119fbb5c9f4600f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9bc925759c05feae7dfa9570e77131d54729c8ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be0376affcafa0bbb371bb501579a825eae32281"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amdgpu: fix zero-size GDS range init on RDNA4", "id": "2486479", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486479"}, "csaw": false, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel's `amdgpu` graphics driver. This vulnerability occurs when the driver attempts to initialize zero-sized graphics memory resources on certain RDNA4 (GFX 12) hardware. If a specific debugging option (`CONFIG_DRM_DEBUG_MM`) is enabled in the kernel configuration, this improper initialization can lead to a kernel crash, resulting in a denial of service for the system."], "name": "CVE-2026-46276", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2026-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46276\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46276\nhttps://lore.kernel.org/linux-cve-announce/2026060839-CVE-2026-46276-1e60@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1f5d33e7b0a9a2a140f46e22fb52eede323c5946)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,9bc925759c05feae7dfa9570e77131d54729c8ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,36f9602fb22ede69fcc8b422be0cf8105bf655ad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,be0376affcafa0bbb371bb501579a825eae32281)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0e21db1a77967bc15df662efdca8ea8a61d124ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,30c000a49094ec568c9b51b7421f7a4a3f0b0298)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3e26c76891ab99fa173e9c501119fbb5c9f4600f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,095a8b0ad3c3b5cdc3850d961adb8a8f735220bb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.10.258)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.15.209)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.1.175)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.6.140)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.86)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.0.4)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.86,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-08T18:30:16.701874+00:00", "updated": "2026-08-13T23:00:06.984642+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}