CVE-2026-80824 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440
https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671
https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19
https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc
https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738
https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3
https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf
https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424
https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef

Type	Values Removed	Values Added
Weaknesses		CWE-416

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: usb: usbfs: fix use-after-free of usb_device in usbdev_release() usbdev_release() drops its reference to the struct usb_device before draining the list of completed async URBs, but that drain path reads back through the same object: free_async() calls dec_usb_memory_use_count() for any URB whose buffer came from the usbfs mmap() region, and its first statement is bus_to_hcd(ps->dev->bus). After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences. This is reachable by an unprivileged process that has read/write access to a /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the mapping, wait for the device to be unplugged, then munmap() and close(). It reproduces on every attempt rather than being a race, because a live MAP_SHARED vma holds a reference on the struct file, so usbdev_release() cannot run until the last vma is gone and the freeing branch of dec_usb_memory_use_count() is always taken. BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410 Read of size 8 at addr ffff8880122ee050 by task poc/769 CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G B 6.12.94 #3 Call Trace: dec_usb_memory_use_count+0x3ae/0x410 free_async+0x2aa/0x4f0 usbdev_release+0x375/0x460 __fput+0x3ea/0xb50 __x64_sys_close+0x86/0x100 Allocated by task 11: usb_alloc_dev+0x55/0xd90 hub_event+0x2524/0x43d0 Freed by task 769: kfree+0x121/0x360 device_release+0xd2/0x280 usb_put_dev+0x23/0x30 usbdev_release+0x2d8/0x460 Release the device reference after the drain loop instead. Nothing between the two points requires it to have been dropped.
Title		usb: usbfs: fix use-after-free of usb_device in usbdev_release()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440 https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671 https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19 https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738 https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3 https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424 https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef

{"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": "2026-09-04T15:54:28.038Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T15:54:28.038Z"}, "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-rc1", "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-rc1"}]}]}], "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"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/usb/core/devio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0a960b88c5979f853019d4dc4957dfbeeb193440", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "bd4bffc621a8cb2f4d9ed9b6447415de524a3bef", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "65879e0a452ca2a234b9475e0c11aff7a4343738", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "b3cde26a66b04f1d90ed0b675899c88b4e49d424", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "5f08c45bdcfd28d1171de38c5ef29fc89a76eedc", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "7f0278e474c4d1c4457974ff1137cc385c944ab3", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "47a7f98fbb5006d46d15a3a210ffdc61448a4f19", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}, {"lessThan": "0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671", "status": "affected", "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/core/devio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.6"}, {"lessThan": "4.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.13", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80824", "lastModified": "2026-09-04T16:18:10.233", "metrics": {}, "published": "2026-09-04T16:18:10.233", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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