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CVE-2026-68456— usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()

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 2.6.16版本存在安全漏洞，该漏洞源于ueagle-atm驱动在探测时使用异步固件加载但未在断开时等待其完成，设备拔出时可能导致固件加载与设备拆卸并发，触发kernfs异常。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b72458a80c75cab832248f536412f386e20a93a0< d85f19aaef42a03e3e4765d659c761c8750a7f23 affected
b72458a80c75cab832248f536412f386e20a93a0< 76861031b43a18065d13f9ffb8595d25c7576005 affected
b72458a80c75cab832248f536412f386e20a93a0< bbfedc84714064ea4845e6b76f96316eb5bb65d8 affected
b72458a80c75cab832248f536412f386e20a93a0< f2a6abc670104fc3e383ee3b1cf35c070485e3df affected
b72458a80c75cab832248f536412f386e20a93a0< c581e30ae5b332d8acef64475a211b3f82099941 affected
b72458a80c75cab832248f536412f386e20a93a0< 509b51327320bdeaef1969248177a446ded073ab affected
b72458a80c75cab832248f536412f386e20a93a0< ddcdac47e1f2651c7be60e299f98faf981522797 affected
b72458a80c75cab832248f536412f386e20a93a0< e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf affected
… +10 more rows
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I. Basic Information for CVE-2026-68456

Vulnerability Information
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Vulnerability Title
usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect() ueagle-atm uses the asynchronous request_firmware_nowait() in .probe(), but does not wait for its completion, not even in .disconnect(); so, if the device is unplugged meanwhile, its teardown runs concurrently with that. Even though this inconsistency is worth addressing on its own, it has also triggered several bug reports in syzbot over the years (some auto-closed) where the firmware sysfs fallback mechanism (CONFIG_FW_LOADER_USER_HELPER) creates a firmware subdirectory in the device directory during its removal, which might hit unexpected conditions in kernfs, apparently, depending at which point the add and remove operations raced. (See links.) The pattern is: usb ?-?: Direct firmware load for ueagle-atm/eagle?.fw failed with error -2 usb ?-?: Falling back to sysfs fallback for: ueagle-atm/eagle?.fw <ERROR> Call trace: ... kernfs_create_dir_ns sysfs_create_dir_ns create_dir kobject_add_internal kobject_add_varg kobject_add class_dir_create_and_add get_device_parent device_add fw_load_sysfs_fallback fw_load_from_user_helper firmware_fallback_sysfs _request_firmware request_firmware_work_func ... (Some variations are observed, after fw_load_sysfs_fallback(), e.g., [1].) While the kernfs side is being looked at, the ueagle-atm side can be fixed by waiting for the pre-firmware load in the .disconnect() handler. This change has a similar approach to previous work by Andrey Tsygunka [2] (wait_for_completion() in .disconnect()), but it is relatively different in design/implementation; using the Originally-by tag for credit assignment. This has been tested with: - synthetic reproducer to check the error path; - USB gadget (virtual device) to check the firmware upload path; - QEMU device emulator to check the device ID re-enumeration path; (The latter two were written by Claude; no other code/text in this commit.) Links (year first reported): 2025 https://syzbot.org/bug?extid=ce1e5a1b4e086b43e56d 2025 https://syzbot.org/bug?extid=9af8471255ac36e34fd4 2024 https://syzbot.org/bug?extid=306212936b13e520679d 2023 https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2 2022 https://syzbot.org/bug?extid=782984d6f1701b526edb 2021 https://syzbot.org/bug?id=f3f221579f4ef7e9691281f3c6f56c05f83e8490 2021 https://syzbot.org/bug?id=84d86f0d71394829df6fc53daf6642c045983881 2021 https://syzbot.org/bug?id=3302dc1c0e2b9c94f2e8edb404eabc9267bc6f90 [1] https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2 [2] https://lore.kernel.org/lkml/20250410093146.3776801-2-aitsygunka@yandex.ru/
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 2.6.16版本存在安全漏洞，该漏洞源于ueagle-atm驱动在探测时使用异步固件加载但未在断开时等待其完成，设备拔出时可能导致固件加载与设备拆卸并发，触发kernfs异常。
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 b72458a80c75cab832248f536412f386e20a93a0 ~ d85f19aaef42a03e3e4765d659c761c8750a7f23 -
Linux Linux 2.6.16 -

II. Public POCs for CVE-2026-68456

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III. Intelligence Information for CVE-2026-68456

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Patches & Fixes for CVE-2026-68456 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72192 9.8 CRITICAL ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head
CVE-2026-72194 9.8 CRITICAL fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow
CVE-2026-72199 9.8 CRITICAL ntfs: validate resident index root values on lookup
CVE-2026-72200 9.8 CRITICAL ntfs: detect mapping-pairs LCN accumulator overflow
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68456

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