248 lines
13 KiB
JSON
248 lines
13 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"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": "2026-08-05T08:47:04.965Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T08:47:04.965Z"
|
|
},
|
|
"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."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"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"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The bcm2835 SPI host driver is reached through local device registration and SPI transfers (e.g. spidev or bound slave drivers) after the controller is instantiated from the platform/device tree; it is not reachable via network protocols or by merely attaching a hot-plugged peripheral.\nAC:L - Once more than four GPIO chipselects are present in the device tree, of_spi_get_gpio_numbers() raises num_chipselect and spi_add_device() accepts high CS indices, so bcm2835_spi_setup()/prepare_message()/DMA paths reliably perform the out-of-bounds accesses with no race or other attacker-uncontrollable condition.\nPR:L - On affected Raspberry Pi and industrial bcm2835 systems, unprivileged local users can open SPI device nodes and trigger transfers that exercise the OOB paths; DT configuration establishing the vulnerable CS count is a realistic deployment precondition rather than a requirement for high privileges at exploit time.\nUI:N - No separate victim action is required; registration at probe and subsequent SPI I/O invoke the vulnerable code without interactive user cooperation.\nS:U - The corruption is confined to kernel memory in the same SPI controller privilege domain and does not cross a VM, IOMMU, or other security authority boundary.\nC:H - Out-of-bounds reads of prepare_cs[] and adjacent bcm2835_spi fields, plus heap corruption from clear_rx_cs[] writes past the allocation, are memory-corruption primitives that can be leveraged for information disclosure.\nI:H - Out-of-bounds writes into prepare_cs[] (overwriting later struct fields such as pointers) and past clear_rx_cs[] into the heap, together with submission of invalid clear_rx_desc[] DMA descriptors, enable integrity compromise and control-flow/DMA abuse.\nA:H - Invalid pointer and DMA descriptor use from the corrupted bcm2835_spi state can cause kernel oops/panic or hangs, yielding a full availability impact."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"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": "571e31fa60b3697d5db26140e16d5c45c51c9815",
|
|
"lessThan": "b5502580cf958b094f3b69dfe4eece90eae01fbc",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "571e31fa60b3697d5db26140e16d5c45c51c9815",
|
|
"lessThan": "82a8ffba54d31e97582051cb56ba1f988018681e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "571e31fa60b3697d5db26140e16d5c45c51c9815",
|
|
"lessThan": "01415ff85a24308059e06ca3e97fd7bf75648690",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "571e31fa60b3697d5db26140e16d5c45c51c9815",
|
|
"lessThan": "13817d466eb8713a1ffd254f537402f091d48444",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"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": "semver"
|
|
},
|
|
{
|
|
"version": "5.4.126",
|
|
"lessThanOrEqual": "5.4.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.44",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.12.11",
|
|
"lessThanOrEqual": "5.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.13",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.4",
|
|
"versionEndExcluding": "5.4.126"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.4",
|
|
"versionEndExcluding": "5.10.44"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.4",
|
|
"versionEndExcluding": "5.12.11"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.4",
|
|
"versionEndExcluding": "5.13"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e"
|
|
},
|
|
{
|
|
"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",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"title": "CISA ADP Vulnrichment",
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2021-47282",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2024-05-23T17:10:17.644618Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-06-04T17:14:52.641Z"
|
|
}
|
|
},
|
|
{
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-08-04T05:32:08.008Z"
|
|
},
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b5502580cf958b094f3b69dfe4eece90eae01fbc",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/82a8ffba54d31e97582051cb56ba1f988018681e",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/01415ff85a24308059e06ca3e97fd7bf75648690",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/13817d466eb8713a1ffd254f537402f091d48444",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |