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However, this issue couldn't be reproduced on kernels <= v6.3.\n\n mce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\n mce: [Hardware Error]: RIP 10:<ffffffff821b9776> {__get_user_nocheck_4+0x6/0x20}\n mce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\n mce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\n mce: [Hardware Error]: Run the above through 'mcelog --ascii'\n mce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\n Kernel panic - not syncing: Fatal local machine check\n\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. 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However, this issue couldn't be reproduced on kernels <= v6.3.\n\n mce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\n mce: [Hardware Error]: RIP 10:<ffffffff821b9776> {__get_user_nocheck_4+0x6/0x20}\n mce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\n mce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\n mce: [Hardware Error]: Run the above through 'mcelog --ascii'\n mce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\n Kernel panic - not syncing: Fatal local machine check\n\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. However, if the fixup type is EX_TYPE_DEFAULT\nthe only thing that is raised for an in-kernel #MC is a panic.\n\nex_handler_uaccess() would warn if users gave a non-canonical addresses\n(with bit 63 clear) to {get, put}_user(), which was unexpected.\n\nTherefore, commit\n\n b19b74bc99b1 (\"x86/mm: Rework address range check in get_user() and put_user()\")\n\nreplaced _ASM_EXTABLE_UA() with _ASM_EXTABLE() for {get, put}_user()\nfixups. However, the new fixup type EX_TYPE_DEFAULT results in a panic.\n\nCommit\n\n 6014bc27561f (\"x86-64: make access_ok() independent of LAM\")\n\nadded the check gp_fault_address_ok() right before the WARN_ONCE() in\nex_handler_uaccess() to not warn about non-canonical user addresses due\nto LAM.\n\nWith that in place, revert back to _ASM_EXTABLE_UA() for {get,put}_user()\nexception fixups in order to be able to handle in-kernel MCEs correctly\nagain.\n\n [ bp: Massage commit message. ]"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/lib: vuelva a _ASM_EXTABLE_UA() para reparaciones de {get,put}_user() Durante la prueba de inyecci\u00f3n de errores de memoria en kernels &gt;= v6.4, el kernel entra en p\u00e1nico como se muestra a continuaci\u00f3n. Sin embargo, este problema no se pudo reproducir en kernels &lt;= v6.3. mce: [Error de hardware]: CPU 296: Excepci\u00f3n de verificaci\u00f3n de la m\u00e1quina: f Banco 1: bd80000000100134 mce: [Error de hardware]: RIP 10: {__get_user_nocheck_4+0x6/0x20} mce: [Error de hardware]: TSC 411a93533ed ADDR 346a87300 40 MISC 86 mce: [Error de hardware]: PROCESADOR 0:a06d0 HORA 1706000767 SOCKET 1 APIC 211 microc\u00f3digo 80001490 mce: [Error de hardware]: Ejecute lo anterior a trav\u00e9s de 'mcelog --ascii' mce: [Error de hardware]: Verificaci\u00f3n de la m\u00e1quina: Carga de datos en un \u00e1rea irrecuperable del kernel P\u00e1nico del kernel - no se sincroniza: verificaci\u00f3n fatal de la m\u00e1quina local El c\u00f3digo MCA se puede recuperar de un #MC en el kernel si el tipo de reparaci\u00f3n es EX_TYPE_UACCESS, lo que indica expl\u00edcitamente que el kernel est\u00e1 intentando acceder a la memoria del espacio de usuario. Sin embargo, si el tipo de reparaci\u00f3n es EX_TYPE_DEFAULT, lo \u00fanico que se genera para un #MC en el kernel es p\u00e1nico. ex_handler_uaccess() advertir\u00eda si los usuarios proporcionaban direcciones no can\u00f3nicas (con el bit 63 claro) a {get, put}_user(), lo cual era inesperado. Por lo tanto, el commit b19b74bc99b1 (\"x86/mm: Reelaborar la verificaci\u00f3n del rango de direcciones en get_user() y put_user()\") reemplaz\u00f3 _ASM_EXTABLE_UA() con _ASM_EXTABLE() para las correcciones de {get, put}_user(). Sin embargo, el nuevo tipo de reparaci\u00f3n EX_TYPE_DEFAULT provoca p\u00e1nico. El commit 6014bc27561f (\"x86-64: hacer que access_ok() sea independiente de LAM\") agreg\u00f3 la verificaci\u00f3n gp_fault_address_ok() justo antes de WARN_ONCE() en ex_handler_uaccess() para no advertir sobre direcciones de usuarios no can\u00f3nicas debido a LAM. Una vez implementado esto, vuelva a _ASM_EXTABLE_UA() para corregir excepciones de {get,put}_user() para poder manejar correctamente los MCE en el kernel nuevamente. [pb: mensaje de commit. ]"}], "id": "CVE-2024-26674", "lastModified": "2025-03-17T15:42:54.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-04-02T07:15:44.033", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2aed1b6c33afd8599d01c6532bbecb829480a674"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2da241c5ed78d0978228a1150735539fe1a60eca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8eed4e00a370b37b4e5985ed983dccedd555ea9d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2aed1b6c33afd8599d01c6532bbecb829480a674"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2da241c5ed78d0978228a1150735539fe1a60eca"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8eed4e00a370b37b4e5985ed983dccedd555ea9d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: x86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups", "id": "2272818", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2272818"}, "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": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups\nDuring memory error injection test on kernels >= v6.4, the kernel panics\nlike below. However, this issue couldn't be reproduced on kernels <= v6.3.\nmce: [Hardware Error]: CPU 296: Machine Check Exception: f Bank 1: bd80000000100134\nmce: [Hardware Error]: RIP 10:<ffffffff821b9776> {__get_user_nocheck_4+0x6/0x20}\nmce: [Hardware Error]: TSC 411a93533ed ADDR 346a8730040 MISC 86\nmce: [Hardware Error]: PROCESSOR 0:a06d0 TIME 1706000767 SOCKET 1 APIC 211 microcode 80001490\nmce: [Hardware Error]: Run the above through 'mcelog --ascii'\nmce: [Hardware Error]: Machine check: Data load in unrecoverable area of kernel\nKernel panic - not syncing: Fatal local machine check\nThe MCA code can recover from an in-kernel #MC if the fixup type is\nEX_TYPE_UACCESS, explicitly indicating that the kernel is attempting to\naccess userspace memory. However, if the fixup type is EX_TYPE_DEFAULT\nthe only thing that is raised for an in-kernel #MC is a panic.\nex_handler_uaccess() would warn if users gave a non-canonical addresses\n(with bit 63 clear) to {get, put}_user(), which was unexpected.\nTherefore, commit\nb19b74bc99b1 (\"x86/mm: Rework address range check in get_user() and put_user()\")\nreplaced _ASM_EXTABLE_UA() with _ASM_EXTABLE() for {get, put}_user()\nfixups. However, the new fixup type EX_TYPE_DEFAULT results in a panic.\nCommit\n6014bc27561f (\"x86-64: make access_ok() independent of LAM\")\nadded the check gp_fault_address_ok() right before the WARN_ONCE() in\nex_handler_uaccess() to not warn about non-canonical user addresses due\nto LAM.\nWith that in place, revert back to _ASM_EXTABLE_UA() for {get,put}_user()\nexception fixups in order to be able to handle in-kernel MCEs correctly\nagain.\n[ bp: Massage commit message. ]"], "name": "CVE-2024-26674", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26674\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26674\nhttps://lore.kernel.org/linux-cve-announce/2024040252-CVE-2024-26674-4ff9@gregkh/T"], "threat_severity": "Low"}

{}