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vuln-cve/data/2023/52xxx/CVE-2023-52894.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2023-52894",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-08-21T06:07:11.013Z",
"datePublished": "2024-08-21T06:10:34.120Z",
"dateUpdated": "2026-05-11T19:35:02.622Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T19:35:02.622Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()\n\nIn Google internal bug 265639009 we've received an (as yet) unreproducible\ncrash report from an aarch64 GKI 5.10.149-android13 running device.\n\nAFAICT the source code is at:\n https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-12-05_13-5.10\n\nThe call stack is:\n ncm_close() -> ncm_notify() -> ncm_do_notify()\nwith the crash at:\n ncm_do_notify+0x98/0x270\nCode: 79000d0b b9000a6c f940012a f9400269 (b9405d4b)\n\nWhich I believe disassembles to (I don't know ARM assembly, but it looks sane enough to me...):\n\n // halfword (16-bit) store presumably to event->wLength (at offset 6 of struct usb_cdc_notification)\n 0B 0D 00 79 strh w11, [x8, #6]\n\n // word (32-bit) store presumably to req->Length (at offset 8 of struct usb_request)\n 6C 0A 00 B9 str w12, [x19, #8]\n\n // x10 (NULL) was read here from offset 0 of valid pointer x9\n // IMHO we're reading 'cdev->gadget' and getting NULL\n // gadget is indeed at offset 0 of struct usb_composite_dev\n 2A 01 40 F9 ldr x10, [x9]\n\n // loading req->buf pointer, which is at offset 0 of struct usb_request\n 69 02 40 F9 ldr x9, [x19]\n\n // x10 is null, crash, appears to be attempt to read cdev->gadget->max_speed\n 4B 5D 40 B9 ldr w11, [x10, #0x5c]\n\nwhich seems to line up with ncm_do_notify() case NCM_NOTIFY_SPEED code fragment:\n\n event->wLength = cpu_to_le16(8);\n req->length = NCM_STATUS_BYTECOUNT;\n\n /* SPEED_CHANGE data is up/down speeds in bits/sec */\n data = req->buf + sizeof *event;\n data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));\n\nMy analysis of registers and NULL ptr deref crash offset\n (Unable to handle kernel NULL pointer dereference at virtual address 000000000000005c)\nheavily suggests that the crash is due to 'cdev->gadget' being NULL when executing:\n data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));\nwhich calls:\n ncm_bitrate(NULL)\nwhich then calls:\n gadget_is_superspeed(NULL)\nwhich reads\n ((struct usb_gadget *)NULL)->max_speed\nand hits a panic.\n\nAFAICT, if I'm counting right, the offset of max_speed is indeed 0x5C.\n(remember there's a GKI KABI reservation of 16 bytes in struct work_struct)\n\nIt's not at all clear to me how this is all supposed to work...\nbut returning 0 seems much better than panic-ing..."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/usb/gadget/function/f_ncm.c"
],
"versions": [
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "fef6b29671b66dfb71f17e337c1ad14b5a2cedae",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "63d161f29cd39c050e8873aa36e0c9fc013bb763",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "a21da7f7aae618c785f7e4a275d43c06dc8412b6",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "e92c70059178da751e5af7de02384b7dfadb5ec7",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "a69c8dfb85b44be9cc223be07d35cc3a9baefbea",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "09e4507ec8ef2d44da6ba4092b8ee2d81f216497",
"status": "affected",
"versionType": "git"
},
{
"version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2",
"lessThan": "c6ec929595c7443250b2a4faea988c62019d5cd2",
"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/usb/gadget/function/f_ncm.c"
],
"versions": [
{
"version": "4.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.9",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.14.304",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.19.271",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.230",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.165",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.90",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.8",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.2",
"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": "4.9",
"versionEndExcluding": "4.14.304"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "4.19.271"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "5.4.230"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "5.10.165"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "5.15.90"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "6.1.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "6.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/fef6b29671b66dfb71f17e337c1ad14b5a2cedae"
},
{
"url": "https://git.kernel.org/stable/c/63d161f29cd39c050e8873aa36e0c9fc013bb763"
},
{
"url": "https://git.kernel.org/stable/c/a21da7f7aae618c785f7e4a275d43c06dc8412b6"
},
{
"url": "https://git.kernel.org/stable/c/e92c70059178da751e5af7de02384b7dfadb5ec7"
},
{
"url": "https://git.kernel.org/stable/c/a69c8dfb85b44be9cc223be07d35cc3a9baefbea"
},
{
"url": "https://git.kernel.org/stable/c/09e4507ec8ef2d44da6ba4092b8ee2d81f216497"
},
{
"url": "https://git.kernel.org/stable/c/c6ec929595c7443250b2a4faea988c62019d5cd2"
}
],
"title": "usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2023-52894",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-09-10T16:03:50.056364Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2024-09-12T17:33:13.931Z"
}
}
]
}
}
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