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CVE-2026-80824— usb: usbfs: fix use-after-free of usb_device in usbdev_release()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于usbfs在usbdev_release()函数清空已完成异步URB列表前释放了usb_device引用，导致释放后重用。具有/dev/bus/usb节点读写权限的低权限进程可触发该漏洞，导致系统崩溃或内存破坏。

AI Predicted 6.0 Difficulty: Easy EPSS 0.19% · P9

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 0a960b88c5979f853019d4dc4957dfbeeb193440 affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< bd4bffc621a8cb2f4d9ed9b6447415de524a3bef affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 65879e0a452ca2a234b9475e0c11aff7a4343738 affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< b3cde26a66b04f1d90ed0b675899c88b4e49d424 affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 5f08c45bdcfd28d1171de38c5ef29fc89a76eedc affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 7f0278e474c4d1c4457974ff1137cc385c944ab3 affected
f7d34b445abc00e979b7cf36b9580ac3d1a47cd8< 47a7f98fbb5006d46d15a3a210ffdc61448a4f19 affected
… +12 more rows
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I. Basic Information for CVE-2026-80824

Vulnerability Information
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Vulnerability Title
usb: usbfs: fix use-after-free of usb_device in usbdev_release()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于usbfs在usbdev_release()函数清空已完成异步URB列表前释放了usb_device引用，导致释放后重用。具有/dev/bus/usb节点读写权限的低权限进程可触发该漏洞，导致系统崩溃或内存破坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 ~ 0a960b88c5979f853019d4dc4957dfbeeb193440 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-80824

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III. Intelligence Information for CVE-2026-80824

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Patches & Fixes for CVE-2026-80824 (8)

Other References for CVE-2026-80824 (1)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80824

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