ghsa-wf38-7v3f-5mjp
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
usb: fix various gadget panics on 10gbps cabling
usb_assign_descriptors() is called with 5 parameters, the last 4 of which are the usb_descriptor_header for: full-speed (USB1.1 - 12Mbps [including USB1.0 low-speed @ 1.5Mbps), high-speed (USB2.0 - 480Mbps), super-speed (USB3.0 - 5Gbps), super-speed-plus (USB3.1 - 10Gbps).
The differences between full/high/super-speed descriptors are usually substantial (due to changes in the maximum usb block size from 64 to 512 to 1024 bytes and other differences in the specs), while the difference between 5 and 10Gbps descriptors may be as little as nothing (in many cases the same tuning is simply good enough).
However if a gadget driver calls usb_assign_descriptors() with a NULL descriptor for super-speed-plus and is then used on a max 10gbps configuration, the kernel will crash with a null pointer dereference, when a 10gbps capable device port + cable + host port combination shows up. (This wouldn't happen if the gadget max-speed was set to 5gbps, but it of course defaults to the maximum, and there's no real reason to artificially limit it)
The fix is to simply use the 5gbps descriptor as the 10gbps descriptor, if a 10gbps descriptor wasn't provided.
Obviously this won't fix the problem if the 5gbps descriptor is also NULL, but such cases can't be so trivially solved (and any such gadgets are unlikely to be used with USB3 ports any way).
{
"affected": [],
"aliases": [
"CVE-2021-47267"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:15Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: fix various gadget panics on 10gbps cabling\n\nusb_assign_descriptors() is called with 5 parameters,\nthe last 4 of which are the usb_descriptor_header for:\n full-speed (USB1.1 - 12Mbps [including USB1.0 low-speed @ 1.5Mbps),\n high-speed (USB2.0 - 480Mbps),\n super-speed (USB3.0 - 5Gbps),\n super-speed-plus (USB3.1 - 10Gbps).\n\nThe differences between full/high/super-speed descriptors are usually\nsubstantial (due to changes in the maximum usb block size from 64 to 512\nto 1024 bytes and other differences in the specs), while the difference\nbetween 5 and 10Gbps descriptors may be as little as nothing\n(in many cases the same tuning is simply good enough).\n\nHowever if a gadget driver calls usb_assign_descriptors() with\na NULL descriptor for super-speed-plus and is then used on a max 10gbps\nconfiguration, the kernel will crash with a null pointer dereference,\nwhen a 10gbps capable device port + cable + host port combination shows up.\n(This wouldn\u0027t happen if the gadget max-speed was set to 5gbps, but\nit of course defaults to the maximum, and there\u0027s no real reason to\nartificially limit it)\n\nThe fix is to simply use the 5gbps descriptor as the 10gbps descriptor,\nif a 10gbps descriptor wasn\u0027t provided.\n\nObviously this won\u0027t fix the problem if the 5gbps descriptor is also\nNULL, but such cases can\u0027t be so trivially solved (and any such gadgets\nare unlikely to be used with USB3 ports any way).",
"id": "GHSA-wf38-7v3f-5mjp",
"modified": "2024-11-01T18:31:25Z",
"published": "2024-05-21T15:31:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47267"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/032e288097a553db5653af552dd8035cd2a0ba96"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/45f9a2fe737dc0a5df270787f2231aee8985cd59"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5ef23506695b01d5d56a13a092a97f2478069d75"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/70cd19cb5bd94bbb5bacfc9c1e4ee0071699a604"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b972eff874637402ddc4a7dd11fb22538a0b6d28"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ca6bc277430d90375452b60b047763a090b7673e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd24be23abf3e94260be0f00bb42c7e91d495f87"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.