CVE-2022-49353

{"id": "CVE-2022-49353", "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": "2025-02-26T07:01:12.013", "references": [{"url": "https://git.kernel.org/stable/c/07bf9431b1590d1cd7a8d62075d0b50b073f0495", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e1295aab2ebcda1c1a9ed342baedc080e5c393e5", "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\npowerpc/papr_scm: don't requests stats with '0' sized stats buffer\n\nSachin reported [1] that on a POWER-10 lpar he is seeing a kernel panic being\nreported with vPMEM when papr_scm probe is being called. The panic is of the\nform below and is observed only with following option disabled(profile) for the\nsaid LPAR 'Enable Performance Information Collection' in the HMC:\n\n Kernel attempted to write user page (1c) - exploit attempt? (uid: 0)\n BUG: Kernel NULL pointer dereference on write at 0x0000001c\n Faulting instruction address: 0xc008000001b90844\n Oops: Kernel access of bad area, sig: 11 [#1]\n<snip>\n NIP [c008000001b90844] drc_pmem_query_stats+0x5c/0x270 [papr_scm]\n LR [c008000001b92794] papr_scm_probe+0x2ac/0x6ec [papr_scm]\n Call Trace:\n 0xc00000000941bca0 (unreliable)\n papr_scm_probe+0x2ac/0x6ec [papr_scm]\n platform_probe+0x98/0x150\n really_probe+0xfc/0x510\n __driver_probe_device+0x17c/0x230\n<snip>\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception\n\nOn investigation looks like this panic was caused due to a 'stat_buffer' of\nsize==0 being provided to drc_pmem_query_stats() to fetch all performance\nstats-ids of an NVDIMM. However drc_pmem_query_stats() shouldn't have been called\nsince the vPMEM NVDIMM doesn't support and performance stat-id's. This was caused\ndue to missing check for 'p->stat_buffer_len' at the beginning of\npapr_scm_pmu_check_events() which indicates that the NVDIMM doesn't support\nperformance-stats.\n\nFix this by introducing the check for 'p->stat_buffer_len' at the beginning of\npapr_scm_pmu_check_events().\n\n[1] https://lore.kernel.org/all/6B3A522A-6A5F-4CC9-B268-0C63AA6E07D3@linux.ibm.com"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/papr_scm: no solicita estad\u00edsticas con un b\u00fafer de estad\u00edsticas de tama\u00f1o '0' Sachin inform\u00f3 [1] que en un LPAR POWER-10 est\u00e1 viendo un p\u00e1nico del kernel que se informa con vPMEM cuando se llama a la sonda papr_scm. El p\u00e1nico tiene el formato siguiente y se observa solo con la siguiente opci\u00f3n deshabilitada (perfil) para dicho LPAR 'Habilitar recopilaci\u00f3n de informaci\u00f3n de rendimiento' en la HMC: El kernel intent\u00f3 escribir la p\u00e1gina del usuario (1c): \u00bfintento de explotaci\u00f3n? (uid: 0) ERROR: Desreferencia de puntero NULL del kernel al escribir en 0x0000001c Direcci\u00f3n de instrucci\u00f3n con error: 0xc008000001b90844 Oops: Acceso del kernel al \u00e1rea defectuosa, sig: 11 [#1] NIP [c008000001b90844] drc_pmem_query_stats+0x5c/0x270 [papr_scm] LR [c008000001b92794] papr_scm_probe+0x2ac/0x6ec [papr_scm] Seguimiento de llamadas: 0xc00000000941bca0 (no confiable) papr_scm_probe+0x2ac/0x6ec [papr_scm] platform_probe+0x98/0x150 really_probe+0xfc/0x510 __driver_probe_device+0x17c/0x230 ---[ fin del seguimiento 0000000000000000 ]--- P\u00e1nico del kernel: no se sincroniza: excepci\u00f3n fatal En la investigaci\u00f3n, parece que este p\u00e1nico se produjo debido a que se proporcion\u00f3 un 'stat_buffer' de tama\u00f1o==0 a drc_pmem_query_stats() para obtener todos los identificadores de estad\u00edsticas de rendimiento de un NVDIMM. Sin embargo, no se deber\u00eda haber llamado a drc_pmem_query_stats() ya que el NVDIMM vPMEM no admite ning\u00fan identificador de estad\u00edsticas de rendimiento. Esto se produjo debido a la falta de verificaci\u00f3n de 'p-&gt;stat_buffer_len' al comienzo de papr_scm_pmu_check_events(), lo que indica que el NVDIMM no admite estad\u00edsticas de rendimiento. Solucione este problema introduciendo la comprobaci\u00f3n de 'p-&gt;stat_buffer_len' al comienzo de papr_scm_pmu_check_events(). [1] https://lore.kernel.org/all/6B3A522A-6A5F-4CC9-B268-0C63AA6E07D3@linux.ibm.com"}], "lastModified": "2025-04-14T19:45:00.240", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:5.18.3:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1F3E9542-4AD8-4E33-8FFD-E0DC34E99EA1"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}