CVE-2026-68456 (GCVE-0-2026-68456)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:05
VLAI
Title
usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()
Summary
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/
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b72458a80c75cab832248f536412f386e20a93a0 , < d85f19aaef42a03e3e4765d659c761c8750a7f23 (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < 76861031b43a18065d13f9ffb8595d25c7576005 (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < bbfedc84714064ea4845e6b76f96316eb5bb65d8 (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < f2a6abc670104fc3e383ee3b1cf35c070485e3df (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < c581e30ae5b332d8acef64475a211b3f82099941 (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < 509b51327320bdeaef1969248177a446ded073ab (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < ddcdac47e1f2651c7be60e299f98faf981522797 (git)
Affected: b72458a80c75cab832248f536412f386e20a93a0 , < e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf (git)
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Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()\n\nueagle-atm uses the asynchronous request_firmware_nowait() in .probe(),\nbut does not wait for its completion, not even in .disconnect(); so, if the\ndevice is unplugged meanwhile, its teardown runs concurrently with that.\n\nEven though this inconsistency is worth addressing on its own, it has also\ntriggered several bug reports in syzbot over the years (some auto-closed)\nwhere the firmware sysfs fallback mechanism (CONFIG_FW_LOADER_USER_HELPER)\ncreates a firmware subdirectory in the device directory during its removal,\nwhich might hit unexpected conditions in kernfs, apparently, depending at\nwhich point the add and remove operations raced. (See links.)\n\nThe pattern is:\n\nusb ?-?: Direct firmware load for ueagle-atm/eagle?.fw failed with error -2\nusb ?-?: Falling back to sysfs fallback for: ueagle-atm/eagle?.fw\n\u003cERROR\u003e\nCall trace:\n ...\n kernfs_create_dir_ns\n sysfs_create_dir_ns\n create_dir\n kobject_add_internal\n kobject_add_varg\n kobject_add\n class_dir_create_and_add\n get_device_parent\n device_add\n fw_load_sysfs_fallback\n fw_load_from_user_helper\n firmware_fallback_sysfs\n _request_firmware\n request_firmware_work_func\n ...\n\n(Some variations are observed, after fw_load_sysfs_fallback(), e.g., [1].)\n\nWhile the kernfs side is being looked at, the ueagle-atm side can be fixed\nby waiting for the pre-firmware load in the .disconnect() handler.\n\nThis change has a similar approach to previous work by Andrey Tsygunka [2]\n(wait_for_completion() in .disconnect()), but it is relatively different in\ndesign/implementation; using the Originally-by tag for credit assignment.\n\nThis has been tested with:\n- synthetic reproducer to check the error path;\n- USB gadget (virtual device) to check the firmware upload path;\n- QEMU device emulator to check the device ID re-enumeration path;\n(The latter two were written by Claude; no other code/text in this commit.)\n\nLinks (year first reported):\n 2025 https://syzbot.org/bug?extid=ce1e5a1b4e086b43e56d\n 2025 https://syzbot.org/bug?extid=9af8471255ac36e34fd4\n 2024 https://syzbot.org/bug?extid=306212936b13e520679d\n 2023 https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2\n 2022 https://syzbot.org/bug?extid=782984d6f1701b526edb\n 2021 https://syzbot.org/bug?id=f3f221579f4ef7e9691281f3c6f56c05f83e8490\n 2021 https://syzbot.org/bug?id=84d86f0d71394829df6fc53daf6642c045983881\n 2021 https://syzbot.org/bug?id=3302dc1c0e2b9c94f2e8edb404eabc9267bc6f90\n\n[1] https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2\n[2] https://lore.kernel.org/lkml/20250410093146.3776801-2-aitsygunka@yandex.ru/"
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        {
          "url": "https://git.kernel.org/stable/c/e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf"
        }
      ],
      "title": "usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()",
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    "cveId": "CVE-2026-68456",
    "datePublished": "2026-08-15T05:51:17.487Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-17T05:05:56.711Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68456\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:17:32.713\",\"lastModified\":\"2026-08-17T06:17:54.763\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()\\n\\nueagle-atm uses the asynchronous request_firmware_nowait() in .probe(),\\nbut does not wait for its completion, not even in .disconnect(); so, if the\\ndevice is unplugged meanwhile, its teardown runs concurrently with that.\\n\\nEven though this inconsistency is worth addressing on its own, it has also\\ntriggered several bug reports in syzbot over the years (some auto-closed)\\nwhere the firmware sysfs fallback mechanism (CONFIG_FW_LOADER_USER_HELPER)\\ncreates a firmware subdirectory in the device directory during its removal,\\nwhich might hit unexpected conditions in kernfs, apparently, depending at\\nwhich point the add and remove operations raced. (See links.)\\n\\nThe pattern is:\\n\\nusb ?-?: Direct firmware load for ueagle-atm/eagle?.fw failed with error -2\\nusb ?-?: Falling back to sysfs fallback for: ueagle-atm/eagle?.fw\\n\u003cERROR\u003e\\nCall trace:\\n ...\\n kernfs_create_dir_ns\\n sysfs_create_dir_ns\\n create_dir\\n kobject_add_internal\\n kobject_add_varg\\n kobject_add\\n class_dir_create_and_add\\n get_device_parent\\n device_add\\n fw_load_sysfs_fallback\\n fw_load_from_user_helper\\n firmware_fallback_sysfs\\n _request_firmware\\n request_firmware_work_func\\n ...\\n\\n(Some variations are observed, after fw_load_sysfs_fallback(), e.g., [1].)\\n\\nWhile the kernfs side is being looked at, the ueagle-atm side can be fixed\\nby waiting for the pre-firmware load in the .disconnect() handler.\\n\\nThis change has a similar approach to previous work by Andrey Tsygunka [2]\\n(wait_for_completion() in .disconnect()), but it is relatively different in\\ndesign/implementation; using the Originally-by tag for credit assignment.\\n\\nThis has been tested with:\\n- synthetic reproducer to check the error path;\\n- USB gadget (virtual device) to check the firmware upload path;\\n- QEMU device emulator to check the device ID re-enumeration path;\\n(The latter two were written by Claude; no other code/text in this commit.)\\n\\nLinks (year first reported):\\n 2025 https://syzbot.org/bug?extid=ce1e5a1b4e086b43e56d\\n 2025 https://syzbot.org/bug?extid=9af8471255ac36e34fd4\\n 2024 https://syzbot.org/bug?extid=306212936b13e520679d\\n 2023 https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2\\n 2022 https://syzbot.org/bug?extid=782984d6f1701b526edb\\n 2021 https://syzbot.org/bug?id=f3f221579f4ef7e9691281f3c6f56c05f83e8490\\n 2021 https://syzbot.org/bug?id=84d86f0d71394829df6fc53daf6642c045983881\\n 2021 https://syzbot.org/bug?id=3302dc1c0e2b9c94f2e8edb404eabc9267bc6f90\\n\\n[1] https://syzkaller.appspot.com/bug?extid=457452d30bcdda75ead2\\n[2] https://lore.kernel.org/lkml/20250410093146.3776801-2-aitsygunka@yandex.ru/\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/atm/ueagle-atm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"d85f19aaef42a03e3e4765d659c761c8750a7f23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"76861031b43a18065d13f9ffb8595d25c7576005\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"bbfedc84714064ea4845e6b76f96316eb5bb65d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"f2a6abc670104fc3e383ee3b1cf35c070485e3df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"c581e30ae5b332d8acef64475a211b3f82099941\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"509b51327320bdeaef1969248177a446ded073ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"ddcdac47e1f2651c7be60e299f98faf981522797\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b72458a80c75cab832248f536412f386e20a93a0\",\"lessThan\":\"e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/atm/ueagle-atm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/509b51327320bdeaef1969248177a446ded073ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76861031b43a18065d13f9ffb8595d25c7576005\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbfedc84714064ea4845e6b76f96316eb5bb65d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c581e30ae5b332d8acef64475a211b3f82099941\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d85f19aaef42a03e3e4765d659c761c8750a7f23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddcdac47e1f2651c7be60e299f98faf981522797\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2a6abc670104fc3e383ee3b1cf35c070485e3df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:55:01+00:00",
      "cve": "CVE-2026-68456",
      "id": "CVE-2026-68456",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68456.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.