{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2021-47282",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-21T13:27:52.128Z",
        "datePublished": "2024-05-21T14:20:08.155Z",
        "dateUpdated": "2024-08-04T05:32:08.008Z"
    },
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                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:05:14.120Z"
            },
            "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/spi/spi-bcm2835.c"
                    ],
                    "versions": [
                        {
                            "version": "571e31fa60b3",
                            "lessThan": "b5502580cf95",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "571e31fa60b3",
                            "lessThan": "82a8ffba54d3",
                            "status": "affected",
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                        {
                            "version": "571e31fa60b3",
                            "lessThan": "01415ff85a24",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "571e31fa60b3",
                            "lessThan": "13817d466eb8",
                            "status": "affected",
                            "versionType": "git"
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                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/spi/spi-bcm2835.c"
                    ],
                    "versions": [
                        {
                            "version": "5.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.4",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.4.126",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.10.44",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.12.11",
                            "lessThanOrEqual": "5.12.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.13",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
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                    "url": "https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc"
                },
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                    "url": "https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e"
                },
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                    "url": "https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690"
                },
                {
                    "url": "https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444"
                }
            ],
            "title": "spi: bcm2835: Fix out-of-bounds access with more than 4 slaves",
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                                "version": "2.0.3",
                                "timestamp": "2024-05-23T17:10:17.644618Z"
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                    "dateUpdated": "2024-08-04T05:32:08.008Z"
                },
                "title": "CVE Program Container",
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