{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-18T03:51:54.979","vulnerabilities":[{"cve":{"id":"CVE-2024-26674","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-04-02T07:15:44.033","lastModified":"2025-03-17T15:42:54.880","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/lib: Revert to _ASM_EXTABLE_UA() for {get,put}_user() fixups\n\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.\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 resolvió la siguiente vulnerabilidad: x86/lib: vuelva a _ASM_EXTABLE_UA() para reparaciones de {get,put}_user() Durante la prueba de inyección de errores de memoria en kernels &gt;= v6.4, el kernel entra en pánico como se muestra a continuación. Sin embargo, este problema no se pudo reproducir en kernels &lt;= v6.3. mce: [Error de hardware]: CPU 296: Excepción de verificación de la máquina: 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 microcódigo 80001490 mce: [Error de hardware]: Ejecute lo anterior a través de 'mcelog --ascii' mce: [Error de hardware]: Verificación de la máquina: Carga de datos en un área irrecuperable del kernel Pánico del kernel - no se sincroniza: verificación fatal de la máquina local El código MCA se puede recuperar de un #MC en el kernel si el tipo de reparación es EX_TYPE_UACCESS, lo que indica explícitamente que el kernel está intentando acceder a la memoria del espacio de usuario. Sin embargo, si el tipo de reparación es EX_TYPE_DEFAULT, lo único que se genera para un #MC en el kernel es pánico. ex_handler_uaccess() advertiría si los usuarios proporcionaban direcciones no canónicas (con el bit 63 claro) a {get, put}_user(), lo cual era inesperado. Por lo tanto, el commit b19b74bc99b1 (\"x86/mm: Reelaborar la verificación del rango de direcciones en get_user() y put_user()\") reemplazó _ASM_EXTABLE_UA() con _ASM_EXTABLE() para las correcciones de {get, put}_user(). Sin embargo, el nuevo tipo de reparación EX_TYPE_DEFAULT provoca pánico. El commit 6014bc27561f (\"x86-64: hacer que access_ok() sea independiente de LAM\") agregó la verificación gp_fault_address_ok() justo antes de WARN_ONCE() en ex_handler_uaccess() para no advertir sobre direcciones de usuarios no canónicas 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. ]"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-787"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.17","matchCriteriaId":"0407B974-1873-4EE4-B984-9520B51F7249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.7.5","matchCriteriaId":"01925741-2C95-47C1-A7EA-3DC2BB0012D3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*","matchCriteriaId":"B9F4EA73-0894-400F-A490-3A397AB7A517"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*","matchCriteriaId":"056BD938-0A27-4569-B391-30578B309EE3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*","matchCriteriaId":"F02056A5-B362-4370-9FF8-6F0BD384D520"}]}]}],"references":[{"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":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","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","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}