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If another CPU is\nconcurrently walking the xarray (e.g. via vm_unmap_aliases()), then it\nmay perform an out-of-bounds access to the remote queue thanks to an\nuninitialised index.\n\nThis has been observed as UBSAN errors in Android:\n\n | Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP\n |\n | Call trace:\n | purge_fragmented_block+0x204/0x21c\n | _vm_unmap_aliases+0x170/0x378\n | vm_unmap_aliases+0x1c/0x28\n | change_memory_common+0x1dc/0x26c\n | set_memory_ro+0x18/0x24\n | module_enable_ro+0x98/0x238\n | do_init_module+0x1b0/0x310\n\nMove the initialisation of 'vb->cpu' in new_vmap_block() ahead of the\naddition to the xarray."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: vmalloc: garantizar que vmap_block se inicialice antes de agregarlo a la cola. El commit 8c61291fd850 (\"mm: corregir referencia vbq incorrecta en purge_fragmented_block\") extendi\u00f3 la estructura 'vmap_block' para que contenga un campo 'cpu' que se establece en el momento de la asignaci\u00f3n en el id de la CPU que se inicializa. Cuando se crea una instancia de 'vmap_block' mediante new_vmap_block(), la estructura parcialmente inicializada se agrega a la matriz x local 'vmap_block_queue' antes de que se haya inicializado el campo 'cpu'. Si otra CPU est\u00e1 recorriendo simult\u00e1neamente la matriz x (por ejemplo, a trav\u00e9s de vm_unmap_aliases()), puede realizar un acceso fuera de los l\u00edmites a la cola remota gracias a un \u00edndice no inicializado. Esto se ha observado como errores UBSAN en Android: | Error interno: UBSAN: \u00edndice de matriz fuera de los l\u00edmites: 00000000f2005512 [#1] PREEMPT SMP | | Rastreo de llamadas: | purge_fragmented_block+0x204/0x21c | _vm_unmap_aliases+0x170/0x378 | vm_unmap_aliases+0x1c/0x28 | change_memory_common+0x1dc/0x26c | set_memory_ro+0x18/0x24 | module_enable_ro+0x98/0x238 | do_init_module+0x1b0/0x310 Mueva la inicializaci\u00f3n de 'vb->cpu' en new_vmap_block() antes de la adici\u00f3n a la matriz x."}], "id": "CVE-2024-46847", "lastModified": "2024-10-02T14:16:08.180", "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"}]}, "published": "2024-09-27T13:15:16.570", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1b2770e27d6d952f491bb362b657e5b2713c3efd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e3de7947c751509027d26b679ecd243bc9db255"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6cf74e0e5e3ab5d5c9defb4c73dad54d52224671"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm: vmalloc: ensure vmap_block is initialised before adding to queue", "id": "2315199", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2315199"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-129", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: vmalloc: ensure vmap_block is initialised before adding to queue\nCommit 8c61291fd850 (\"mm: fix incorrect vbq reference in\npurge_fragmented_block\") extended the 'vmap_block' structure to contain a\n'cpu' field which is set at allocation time to the id of the initialising\nCPU.\nWhen a new 'vmap_block' is being instantiated by new_vmap_block(), the\npartially initialised structure is added to the local 'vmap_block_queue'\nxarray before the 'cpu' field has been initialised. If another CPU is\nconcurrently walking the xarray (e.g. via vm_unmap_aliases()), then it\nmay perform an out-of-bounds access to the remote queue thanks to an\nuninitialised index.\nThis has been observed as UBSAN errors in Android:\n| Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP\n|\n| Call trace:\n| purge_fragmented_block+0x204/0x21c\n| _vm_unmap_aliases+0x170/0x378\n| vm_unmap_aliases+0x1c/0x28\n| change_memory_common+0x1dc/0x26c\n| set_memory_ro+0x18/0x24\n| module_enable_ro+0x98/0x238\n| do_init_module+0x1b0/0x310\nMove the initialisation of 'vb->cpu' in new_vmap_block() ahead of the\naddition to the xarray."], "name": "CVE-2024-46847", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-09-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46847\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46847\nhttps://lore.kernel.org/linux-cve-announce/2024092756-CVE-2024-46847-e469@gregkh/T"], "threat_severity": "Moderate"}

{}