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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 0a960b88c5979f853019d4dc4957dfbeeb193440, 0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671, 47a7f98fbb5006d46d15a3a210ffdc61448a4f19; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 0a960b88c5979f853019d4dc4957dfbeeb193440, 0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671, 47a7f98fbb5006d46d15a3a210ffdc61448a4f19; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.6affected
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 0a960b88c5979f853019d4dc4957dfbeeb193440affected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cfaffected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before bd4bffc621a8cb2f4d9ed9b6447415de524a3befaffected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 65879e0a452ca2a234b9475e0c11aff7a4343738affected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before b3cde26a66b04f1d90ed0b675899c88b4e49d424affected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 5f08c45bdcfd28d1171de38c5ef29fc89a76eedcaffected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 7f0278e474c4d1c4457974ff1137cc385c944ab3affected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 47a7f98fbb5006d46d15a3a210ffdc61448a4f19affected · git
    • f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 and later · before 0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80822Sep 4, 2026 · mailbox: mchp-ipc-sbi: Add null check for devm_kasprintf()
    0Monitor
  • ← EarlierCVE-2026-80823Sep 4, 2026 · nfc: st21nfca: validate ATR_REQ length against the received frame
    0Monitor
  • Later →CVE-2026-80825Sep 4, 2026 · wifi: mt76: mt7925: ensure tx headroom in usb_sdio_tx_prepare_skb
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0a960b88c5979f853019d4dc4957dfbeeb193440Vendor (CNA)
Linux Linux0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671Vendor (CNA)
Linux Linux47a7f98fbb5006d46d15a3a210ffdc61448a4f19Vendor (CNA)
Linux Linux5f08c45bdcfd28d1171de38c5ef29fc89a76eedcVendor (CNA)
Linux Linux65879e0a452ca2a234b9475e0c11aff7a4343738Vendor (CNA)
Linux Linux7f0278e474c4d1c4457974ff1137cc385c944ab3Vendor (CNA)
Linux Linux96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cfVendor (CNA)
Linux Linuxb3cde26a66b04f1d90ed0b675899c88b4e49d424Vendor (CNA)
Linux Linuxbd4bffc621a8cb2f4d9ed9b6447415de524a3befVendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
rocky linux:kernel0:4.18.0-553.178.1.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.178.1.rt7.519.el8_10 · Rocky Linux:8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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