CVE-2026-80824: linux
Vulnerability summary
CVE-2026-80824 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 04-09-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
9%
Versus all other CVEs
30-day change
0.00 pp
From 0.19% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu168 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.111-1 | < 7.1.13-1
- linux-6.12< 6.12.111-1~deb12u1
Linux1 product
- linux≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 0a960b88c5979f853019d4dc4957dfbeeb193440 | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < bd4bffc621a8cb2f4d9ed9b6447415de524a3bef | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 65879e0a452ca2a234b9475e0c11aff7a4343738 | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < b3cde26a66b04f1d90ed0b675899c88b4e49d424 | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 5f08c45bdcfd28d1171de38c5ef29fc89a76eedc | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 7f0278e474c4d1c4457974ff1137cc385c944ab3 | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 47a7f98fbb5006d46d15a3a210ffdc61448a4f19 | ≥ f7d34b445abc00e979b7cf36b9580ac3d1a47cd8, < 0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671 | 4.6
3 vendors · 171 products
