{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-05T08:06:10.812","vulnerabilities":[{"cve":{"id":"CVE-2021-47282","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-05-21T15:15:16.430","lastModified":"2025-04-30T14:30:12.573","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nspi: bcm2835: Fix out-of-bounds access with more than 4 slaves\n\nCommit 571e31fa60b3 (\"spi: bcm2835: Cache CS register value for\n->prepare_message()\") limited the number of slaves to 3 at compile-time.\nThe limitation was necessitated by a statically-sized array prepare_cs[]\nin the driver private data which contains a per-slave register value.\n\nThe commit sought to enforce the limitation at run-time by setting the\ncontroller's num_chipselect to 3:  Slaves with a higher chipselect are\nrejected by spi_add_device().\n\nHowever the commit neglected that num_chipselect only limits the number\nof *native* chipselects.  If GPIO chipselects are specified in the\ndevice tree for more than 3 slaves, num_chipselect is silently raised by\nof_spi_get_gpio_numbers() and the result are out-of-bounds accesses to\nthe statically-sized array prepare_cs[].\n\nAs a bandaid fix which is backportable to stable, raise the number of\nallowed slaves to 24 (which \"ought to be enough for anybody\"), enforce\nthe limitation on slave ->setup and revert num_chipselect to 3 (which is\nthe number of native chipselects supported by the controller).\nAn upcoming for-next commit will allow an arbitrary number of slaves."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: bcm2835: corrige el acceso fuera de los límites con más de 4 esclavos. La confirmación 571e31fa60b3 (\"spi: bcm2835: valor de registro CS de caché para ->prepare_message()\") limitó el número de esclavos a 3 en tiempo de compilación. La limitación fue necesaria por una matriz de tamaño estático prepare_cs[] en los datos privados del controlador que contiene un valor de registro por esclavo. La confirmación buscaba hacer cumplir la limitación en tiempo de ejecución estableciendo num_chipselect del controlador en 3: spi_add_device() rechaza los esclavos con una selección de chip más alta. Sin embargo, la confirmación omitió que num_chipselect solo limita el número de selecciones de chips *nativas*. Si se especifican selecciones de chips GPIO en el árbol de dispositivos para más de 3 esclavos, of_spi_get_gpio_numbers() genera silenciosamente num_chipselect y el resultado son accesos fuera de los límites a la matriz de tamaño estático prepare_cs[]. Como solución curita que se puede volver a transferir a estable, aumente la cantidad de esclavos permitidos a 24 (lo que \"debería ser suficiente para cualquiera\"), aplique la limitación en esclavo -> configuración y revierta num_chipselect a 3 (que es la cantidad de nativos selecciones de chips admitidas por el controlador). Una próxima confirmación para la próxima permitirá una cantidad arbitraria de esclavos."}],"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:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"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":"5.4","versionEndExcluding":"5.4.126","matchCriteriaId":"6D23A3FF-8CE4-41A1-9E6A-8138FDC413F6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.44","matchCriteriaId":"DA547B08-9D25-467B-AD0D-8460FE4EE70D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.12.11","matchCriteriaId":"F914A757-FAFD-407E-9031-21F66635D5EA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*","matchCriteriaId":"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*","matchCriteriaId":"96AC23B2-D46A-49D9-8203-8E1BEDCA8532"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*","matchCriteriaId":"DA610E30-717C-4700-9F77-A3C9244F3BFD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*","matchCriteriaId":"1ECD33F5-85BE-430B-8F86-8D7BD560311D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*","matchCriteriaId":"CF351855-2437-4CF5-AD7C-BDFA51F27683"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}