CVE-2024-50223

{"id": "CVE-2024-50223", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-11-09T11:15:07.807", "references": [{"url": "https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: Fix the potential null pointer dereference in task_numa_work()\n\nWhen running stress-ng-vm-segv test, we found a null pointer dereference\nerror in task_numa_work(). Here is the backtrace:\n\n [323676.066985] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020\n ......\n [323676.067108] CPU: 35 PID: 2694524 Comm: stress-ng-vm-se\n ......\n [323676.067113] pstate: 23401009 (nzCv daif +PAN -UAO +TCO +DIT +SSBS BTYPE=--)\n [323676.067115] pc : vma_migratable+0x1c/0xd0\n [323676.067122] lr : task_numa_work+0x1ec/0x4e0\n [323676.067127] sp : ffff8000ada73d20\n [323676.067128] x29: ffff8000ada73d20 x28: 0000000000000000 x27: 000000003e89f010\n [323676.067130] x26: 0000000000080000 x25: ffff800081b5c0d8 x24: ffff800081b27000\n [323676.067133] x23: 0000000000010000 x22: 0000000104d18cc0 x21: ffff0009f7158000\n [323676.067135] x20: 0000000000000000 x19: 0000000000000000 x18: ffff8000ada73db8\n [323676.067138] x17: 0001400000000000 x16: ffff800080df40b0 x15: 0000000000000035\n [323676.067140] x14: ffff8000ada73cc8 x13: 1fffe0017cc72001 x12: ffff8000ada73cc8\n [323676.067142] x11: ffff80008001160c x10: ffff000be639000c x9 : ffff8000800f4ba4\n [323676.067145] x8 : ffff000810375000 x7 : ffff8000ada73974 x6 : 0000000000000001\n [323676.067147] x5 : 0068000b33e26707 x4 : 0000000000000001 x3 : ffff0009f7158000\n [323676.067149] x2 : 0000000000000041 x1 : 0000000000004400 x0 : 0000000000000000\n [323676.067152] Call trace:\n [323676.067153] vma_migratable+0x1c/0xd0\n [323676.067155] task_numa_work+0x1ec/0x4e0\n [323676.067157] task_work_run+0x78/0xd8\n [323676.067161] do_notify_resume+0x1ec/0x290\n [323676.067163] el0_svc+0x150/0x160\n [323676.067167] el0t_64_sync_handler+0xf8/0x128\n [323676.067170] el0t_64_sync+0x17c/0x180\n [323676.067173] Code: d2888001 910003fd f9000bf3 aa0003f3 (f9401000)\n [323676.067177] SMP: stopping secondary CPUs\n [323676.070184] Starting crashdump kernel...\n\nstress-ng-vm-segv in stress-ng is used to stress test the SIGSEGV error\nhandling function of the system, which tries to cause a SIGSEGV error on\nreturn from unmapping the whole address space of the child process.\n\nNormally this program will not cause kernel crashes. But before the\nmunmap system call returns to user mode, a potential task_numa_work()\nfor numa balancing could be added and executed. In this scenario, since the\nchild process has no vma after munmap, the vma_next() in task_numa_work()\nwill return a null pointer even if the vma iterator restarts from 0.\n\nRecheck the vma pointer before dereferencing it in task_numa_work()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/numa: Se corrige la posible desreferencia de puntero nulo en task_numa_work(). Al ejecutar la prueba stress-ng-vm-segv, encontramos un error de desreferencia de puntero nulo en task_numa_work(). Aqu\u00ed est\u00e1 el backtrace: [323676.066985] No se puede manejar la desreferencia del puntero NULL del n\u00facleo en la direcci\u00f3n virtual 0000000000000020 ...... [323676.067108] CPU: 35 PID: 2694524 Comm: stress-ng-vm-se ...... [323676.067113] pstate: 23401009 (nzCv daif +PAN -UAO +TCO +DIT +SSBS BTYPE=--) [323676.067115] pc : vma_migratable+0x1c/0xd0 [323676.067122] lr : task_numa_work+0x1ec/0x4e0 [323676.067127] sp : ffff8000ada73d20 [323676.067128] x29: ffff8000ada73d20 x28: 0000000000000000 x27: 000000003e89f010 [323676.067130] x26: 0000000000080000 x25: ffff800081b5c0d8 x24: ffff800081b27000 [323676.067133] x23: 0000000000010000 x22: 0000000104d18cc0 x21: ffff0009f7158000 [323676.067135] x20: 0000000000000000 x19: 0000000000000000 x18: ffff8000ada73db8 [323676.067138] x17: 0001400000000000 x16: ffff800080df40b0 x15: 0000000000000035 [323676.067140] x14: ffff8000ada73cc8 x13: 1fffe0017cc72001 x12: ffff8000ada73cc8 [323676.067142] x11: ffff80008001160c x10: ffff000be639000c x9: ffff8000800f4ba4 [323676.067145] x8: ffff000810375000 x7: ffff8000ada73974 x6: 0000000000000001 [323676.067147] x5: 0068000b33e26707 x4: 0000000000000001 x3: ffff0009f7158000 [323676.067149] x2: 0000000000000041 x1: 00000000000004400 x0 : 0000000000000000 [323676.067152] Seguimiento de llamadas: [323676.067153] vma_migratable+0x1c/0xd0 [323676.067155] task_numa_work+0x1ec/0x4e0 [323676.067157] task_work_run+0x78/0xd8 [323676.067161] do_notify_resume+0x1ec/0x290 [323676.067163] el0_svc+0x150/0x160 [323676.067167] el0t_64_sync_handler+0xf8/0x128 [323676.067170] el0t_64_sync+0x17c/0x180 [323676.067173] C\u00f3digo: d2888001 910003fd f9000bf3 aa0003f3 (f9401000) [323676.067177] SMP: deteniendo las CPU secundarias [323676.070184] Iniciando el kernel de volcado de memoria... stress-ng-vm-segv en stress-ng se utiliza para realizar pruebas de estr\u00e9s a la funci\u00f3n de manejo de errores SIGSEGV del sistema, que intenta causar un error SIGSEGV al regresar de anular la asignaci\u00f3n de todo el espacio de direcciones del proceso secundario. Normalmente, este programa no causar\u00e1 fallas del kernel. Pero antes de que la llamada al sistema munmap vuelva al modo de usuario, se podr\u00eda agregar y ejecutar una posible task_numa_work() para el equilibrio de NUMA. En este escenario, dado que el proceso secundario no tiene ning\u00fan vma despu\u00e9s de munmap, vma_next() en task_numa_work() devolver\u00e1 un puntero nulo incluso si el iterador vma se reinicia desde 0. Vuelva a verificar el puntero vma antes de desreferenciarlo en task_numa_work()."}], "lastModified": "2024-11-13T19:22:54.647", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "00A8F309-31B3-44B6-9284-6F2907A64956", "versionEndExcluding": "6.6.60", "versionStartIncluding": "6.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E96F53A4-5E87-4A70-BD9A-BC327828D57F", "versionEndExcluding": "6.11.7", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0F717D8-3014-4F84-8086-0124B2111379"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24DBE6C7-2AAE-4818-AED2-E131F153D2FA"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}