CVE-2026-68456
usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()
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/[email protected]/
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ b72458a80c75cab832248f536412f386e20a93a0; < d85f19aaef42a03e3e4765d659c761c8750a7f23 (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < 76861031b43a18065d13f9ffb8595d25c7576005 (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < bbfedc84714064ea4845e6b76f96316eb5bb65d8 (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < f2a6abc670104fc3e383ee3b1cf35c070485e3df (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < c581e30ae5b332d8acef64475a211b3f82099941 (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < 509b51327320bdeaef1969248177a446ded073ab (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < ddcdac47e1f2651c7be60e299f98faf981522797 (affected, git) ≥ b72458a80c75cab832248f536412f386e20a93a0; < e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.16 (affected) ≥ 0; < 2.6.16 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/d85f19aaef42a03e3e4765d659c761c8750a7f23CNA: Linux
- https://git.kernel.org/stable/c/76861031b43a18065d13f9ffb8595d25c7576005CNA: Linux
- https://git.kernel.org/stable/c/bbfedc84714064ea4845e6b76f96316eb5bb65d8CNA: Linux
- https://git.kernel.org/stable/c/f2a6abc670104fc3e383ee3b1cf35c070485e3dfCNA: Linux
- https://git.kernel.org/stable/c/c581e30ae5b332d8acef64475a211b3f82099941CNA: Linux
- https://git.kernel.org/stable/c/509b51327320bdeaef1969248177a446ded073abCNA: Linux
- https://git.kernel.org/stable/c/ddcdac47e1f2651c7be60e299f98faf981522797CNA: Linux
- https://git.kernel.org/stable/c/e2674dfbed8a30d57e2bc872c4bfa6c3eec918bfCNA: Linux
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.