usb: usbfs: fix use-after-free of usb_device in usbdev_release()
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 __x6
CVE-2026-80824
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80824
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "0a960b88c5979f853019d4dc4957dfbeeb193440",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "bd4bffc621a8cb2f4d9ed9b6447415de524a3bef",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "65879e0a452ca2a234b9475e0c11aff7a4343738",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "b3cde26a66b04f1d90ed0b675899c88b4e49d424",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "5f08c45bdcfd28d1171de38c5ef29fc89a76eedc",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "7f0278e474c4d1c4457974ff1137cc385c944ab3",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "47a7f98fbb5006d46d15a3a210ffdc61448a4f19",
"versionType": "git"
},
{
"status": "affected",
"version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8",
"lessThan": "0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/core/devio.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/core/devio.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80824
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34840 · Revision 1
- Added to Heist Feed
- Publisher date