335 lines
18 KiB
JSON
335 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26748",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.168Z",
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"datePublished": "2024-04-03T17:00:35.087Z",
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"dateUpdated": "2026-08-05T11:26:59.831Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:26:59.831Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdns3: fix memory double free when handle zero packet\n\n829 if (request->complete) {\n830 spin_unlock(&priv_dev->lock);\n831 usb_gadget_giveback_request(&priv_ep->endpoint,\n832 request);\n833 spin_lock(&priv_dev->lock);\n834 }\n835\n836 if (request->buf == priv_dev->zlp_buf)\n837 cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);\n\nDriver append an additional zero packet request when queue a packet, which\nlength mod max packet size is 0. When transfer complete, run to line 831,\nusb_gadget_giveback_request() will free this requestion. 836 condition is\ntrue, so cdns3_gadget_ep_free_request() free this request again.\n\nLog:\n\n[ 1920.140696][ T150] BUG: KFENCE: use-after-free read in cdns3_gadget_giveback+0x134/0x2c0 [cdns3]\n[ 1920.140696][ T150]\n[ 1920.151837][ T150] Use-after-free read at 0x000000003d1cd10b (in kfence-#36):\n[ 1920.159082][ T150] cdns3_gadget_giveback+0x134/0x2c0 [cdns3]\n[ 1920.164988][ T150] cdns3_transfer_completed+0x438/0x5f8 [cdns3]\n\nAdd check at line 829, skip call usb_gadget_giveback_request() if it is\nadditional zero length packet request. Needn't call\nusb_gadget_giveback_request() because it is allocated in this driver."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is selected entirely by locally queued transfer parameters (`req->zero` plus `length % maxpacket == 0`) set by in-kernel function drivers on behalf of local userspace — USB-Ethernet/NCM tethering, the printer gadget, UVC streaming — not by anything a USB peer supplies, so no physical action by the attacker is needed on a peripheral in its normal connected operating state. This matches the AV:L treatment of the sibling cdns3 gadget flaw CVE-2024-26747.\nAC:L - The attacker fully controls the transfer length, and the ZLP request append plus the buggy giveback sequence follow deterministically; the lock-drop window around `usb_gadget_giveback_request()` is one the attacker widens at will by queuing transfers concurrently from multiple threads.\nPR:L - Once the gadget is configured (normal system state on these embedded boards), any unprivileged process can drive the path — e.g. sending a UDP datagram sized so the NCM/ECM frame is an exact multiple of the 512/1024-byte bulk-IN maxpacket over `usb0`, or writing to `/dev/g_printer0` or the UVC gadget node — with no capability check anywhere on the path.\nUI:N - No victim action is required; the affected devices operate as USB peripherals attached to a host as their normal deployed state, and the attacker triggers the flaw purely by generating traffic.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The flaw includes a confirmed use-after-free read of a freed `struct cdns3_request` (KFENCE-reported), and the double free of a kmalloc-192 general-cache object lets an attacker reallocate it with sprayed data and have the driver disclose or act on it, enabling arbitrary kernel memory disclosure.\nI:H - Freeing a still-live request returns an in-use object to the general slab allocator while the driver continues writing into it (`request->actual`, `finished_trb`, TRB pointers, list linkage), a classic double-free/UAF write primitive leveragable for control-flow hijack and privilege escalation.\nA:H - The double free corrupts slab freelists and the endpoint request lists, reliably producing kernel oops/panic, and it can be re-triggered at will by an unprivileged local process."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/cdns3/cdns3-gadget.c"
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],
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"versions": [
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{
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"version": "7733f6c32e36ff9d7adadf40001039bf219b1cbe",
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"lessThan": "aad6132ae6e4809e375431f8defd1521985e44e7",
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"status": "affected",
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"status": "affected",
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{
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/usb/cdns3/cdns3-gadget.c"
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],
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{
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"version": "5.4",
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"status": "affected"
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"version": "0",
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},
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{
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"version": "5.4.270",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.211",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.150",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.7.7",
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{
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"version": "6.8",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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