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vuln-cve/data/2026/80xxx/CVE-2026-80824.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80824",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.795Z",
"datePublished": "2026-09-04T15:54:28.038Z",
"dateUpdated": "2026-10-19T08:44:16.840Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:44:16.840Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usbfs: fix use-after-free of usb_device in usbdev_release()\n\nusbdev_release() drops its reference to the struct usb_device before\ndraining the list of completed async URBs, but that drain path reads back\nthrough the same object: free_async() calls dec_usb_memory_use_count()\nfor any URB whose buffer came from the usbfs mmap() region, and its first\nstatement is bus_to_hcd(ps->dev->bus).\n\nAfter a disconnect the usbfs reference can be the last one, in which case\nusb_put_dev() frees the device and the subsequent loop reads offset 80 of\nfreed memory and uses the result as a struct usb_hcd *, which\nhcd_buffer_free_pages() then dereferences.\n\nThis is reachable by an unprivileged process that has read/write access to\na /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the\nmapping, wait for the device to be unplugged, then munmap() and close().\nIt reproduces on every attempt rather than being a race, because a live\nMAP_SHARED vma holds a reference on the struct file, so usbdev_release()\ncannot run until the last vma is gone and the freeing branch of\ndec_usb_memory_use_count() is always taken.\n\n BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410\n Read of size 8 at addr ffff8880122ee050 by task poc/769\n CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G B 6.12.94 #3\n\n Call Trace:\n dec_usb_memory_use_count+0x3ae/0x410\n free_async+0x2aa/0x4f0\n usbdev_release+0x375/0x460\n __fput+0x3ea/0xb50\n __x64_sys_close+0x86/0x100\n\n Allocated by task 11:\n usb_alloc_dev+0x55/0xd90\n hub_event+0x2524/0x43d0\n\n Freed by task 769:\n kfree+0x121/0x360\n device_release+0xd2/0x280\n usb_put_dev+0x23/0x30\n usbdev_release+0x2d8/0x460\n\nRelease the device reference after the drain loop instead. Nothing between\nthe two points requires it to have been dropped."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/usb/core/devio.c"
],
"versions": [
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "0a960b88c5979f853019d4dc4957dfbeeb193440",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "bd4bffc621a8cb2f4d9ed9b6447415de524a3bef",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "65879e0a452ca2a234b9475e0c11aff7a4343738",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "b3cde26a66b04f1d90ed0b675899c88b4e49d424",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "5f08c45bdcfd28d1171de38c5ef29fc89a76eedc",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "7f0278e474c4d1c4457974ff1137cc385c944ab3",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "47a7f98fbb5006d46d15a3a210ffdc61448a4f19",
"status": "affected",
"versionType": "git"
},
{
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671",
"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/core/devio.c"
],
"versions": [
{
"version": "4.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.269",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.220",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.187",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.156",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.108",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.49",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.13",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.3",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"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": "4.6",
"versionEndExcluding": "5.10.269"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "5.15.220"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.1.187"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.6.156"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.12.108"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "6.18.49"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "7.1.13"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "7.2.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.6",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440"
},
{
"url": "https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf"
},
{
"url": "https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef"
},
{
"url": "https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738"
},
{
"url": "https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424"
},
{
"url": "https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc"
},
{
"url": "https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3"
},
{
"url": "https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19"
},
{
"url": "https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671"
}
],
"title": "usb: usbfs: fix use-after-free of usb_device in usbdev_release()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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