Vulnerability-Lookup

GHSA-W6HM-PC27-4XCR

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

USB: chaoskey: Fix slab-use-after-free in chaoskey_release()

The chaoskey driver has a use-after-free bug in its release routine. If the user closes the device file after the USB device has been unplugged, a debugging log statement will try to access the usb_interface structure after it has been deallocated:

BUG: KASAN: slab-use-after-free in dev_driver_string (drivers/base/core.c:2406)
Read of size 8 at addr ffff888168e8a0b8 by task chaoskey_raw_re/10106

Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
 print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
 kasan_report (mm/kasan/report.c:595)
 dev_driver_string (drivers/base/core.c:2406)
 __dynamic_dev_dbg (lib/dynamic_debug.c:906)
 chaoskey_release (drivers/usb/misc/chaoskey.c:323)
 __fput (fs/file_table.c:510)
 fput_close_sync (fs/file_table.c:615)
 __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492)
 do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
 entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

The driver's last reference to the interface structure is dropped in the chaoskey_free() routine, so the code must not use the interface -- even in a debugging statement -- after that routine returns. (Exception: If we know that another reference is held by someone else, such as the device core while the disconnect routine runs, there's no problem. Thanks to Johan Hovold for pointing this out.)

Since the bad access is part of an unimportant debugging statement, we can fix the problem simply by removing the whole statement.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64455"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: chaoskey: Fix slab-use-after-free in chaoskey_release()\n\nThe chaoskey driver has a use-after-free bug in its release routine.\nIf the user closes the device file after the USB device has been\nunplugged, a debugging log statement will try to access the\nusb_interface structure after it has been deallocated:\n\n\tBUG: KASAN: slab-use-after-free in dev_driver_string (drivers/base/core.c:2406)\n\tRead of size 8 at addr ffff888168e8a0b8 by task chaoskey_raw_re/10106\n\n\tHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n\tCall Trace:\n\t \u003cTASK\u003e\n\t dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\n\t print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n\t kasan_report (mm/kasan/report.c:595)\n\t dev_driver_string (drivers/base/core.c:2406)\n\t __dynamic_dev_dbg (lib/dynamic_debug.c:906)\n\t chaoskey_release (drivers/usb/misc/chaoskey.c:323)\n\t __fput (fs/file_table.c:510)\n\t fput_close_sync (fs/file_table.c:615)\n\t __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492)\n\t do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\n\t entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nThe driver\u0027s last reference to the interface structure is dropped in\nthe chaoskey_free() routine, so the code must not use the interface --\neven in a debugging statement -- after that routine returns.\n(Exception: If we know that another reference is held by someone else,\nsuch as the device core while the disconnect routine runs, there\u0027s no\nproblem.  Thanks to Johan Hovold for pointing this out.)\n\nSince the bad access is part of an unimportant debugging statement,\nwe can fix the problem simply by removing the whole statement.",
  "id": "GHSA-w6hm-pc27-4xcr",
  "modified": "2026-07-25T12:31:36Z",
  "published": "2026-07-25T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64455"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a52d55c86a429dac47886b8424e67f90b001e67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c82f88bc7a8458d5c60f9b354c4d32d233f0cac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f50613bff228272577893aa10a346a2f3063e49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abf76d3239dee97b66e7241ad04811f1ce562e28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3e409476ad0703c54c14f245e4e143c8124e1bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe7a0f4be283b40dd592540027279735120d0d6f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64455 (GCVE-0-2026-64455)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

USB: chaoskey: Fix slab-use-after-free in chaoskey_release()

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: chaoskey: Fix slab-use-after-free in chaoskey_release() The chaoskey driver has a use-after-free bug in its release routine. If the user closes the device file after the USB device has been unplugged, a debugging log statement will try to access the usb_interface structure after it has been deallocated: BUG: KASAN: slab-use-after-free in dev_driver_string (drivers/base/core.c:2406) Read of size 8 at addr ffff888168e8a0b8 by task chaoskey_raw_re/10106 Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) dev_driver_string (drivers/base/core.c:2406) __dynamic_dev_dbg (lib/dynamic_debug.c:906) chaoskey_release (drivers/usb/misc/chaoskey.c:323) __fput (fs/file_table.c:510) fput_close_sync (fs/file_table.c:615) __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) The driver's last reference to the interface structure is dropped in the chaoskey_free() routine, so the code must not use the interface -- even in a debugging statement -- after that routine returns. (Exception: If we know that another reference is held by someone else, such as the device core while the disconnect routine runs, there's no problem. Thanks to Johan Hovold for pointing this out.) Since the bad access is part of an unimportant debugging statement, we can fix the problem simply by removing the whole statement.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/fe7a0f4be283b40dd…
https://git.kernel.org/stable/c/5ec61fbef9ec5635c…
https://git.kernel.org/stable/c/f3e409476ad0703c5…
https://git.kernel.org/stable/c/6c82f88bc7a8458d5…
https://git.kernel.org/stable/c/3ad5fbcced4e9c2b0…
https://git.kernel.org/stable/c/2a52d55c86a429dac…
https://git.kernel.org/stable/c/8f50613bff2282725…
https://git.kernel.org/stable/c/abf76d3239dee97b6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 66e3e591891da9899a8990792da080432531ffd4 , < fe7a0f4be283b40dd592540027279735120d0d6f (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023 (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < f3e409476ad0703c54c14f245e4e143c8124e1bd (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < 6c82f88bc7a8458d5c60f9b354c4d32d233f0cac (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89 (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < 2a52d55c86a429dac47886b8424e67f90b001e67 (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < 8f50613bff228272577893aa10a346a2f3063e49 (git) Affected: 66e3e591891da9899a8990792da080432531ffd4 , < abf76d3239dee97b66e7241ad04811f1ce562e28 (git)
Linux	Linux	Affected: 4.1 Unaffected: 0 , < 4.1 (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: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/misc/chaoskey.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            {
              "lessThan": "fe7a0f4be283b40dd592540027279735120d0d6f",
              "status": "affected",
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              "versionType": "git"
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            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "6c82f88bc7a8458d5c60f9b354c4d32d233f0cac",
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              "version": "66e3e591891da9899a8990792da080432531ffd4",
              "versionType": "git"
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            },
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              "lessThan": "2a52d55c86a429dac47886b8424e67f90b001e67",
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            },
            {
              "lessThan": "8f50613bff228272577893aa10a346a2f3063e49",
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              "versionType": "git"
            },
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              "versionType": "git"
            }
          ]
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.1"
            },
            {
              "lessThan": "4.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "5.10.261",
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                  "vulnerable": true
                },
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                  "vulnerable": true
                },
                {
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                {
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                  "versionStartIncluding": "4.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: chaoskey: Fix slab-use-after-free in chaoskey_release()\n\nThe chaoskey driver has a use-after-free bug in its release routine.\nIf the user closes the device file after the USB device has been\nunplugged, a debugging log statement will try to access the\nusb_interface structure after it has been deallocated:\n\n\tBUG: KASAN: slab-use-after-free in dev_driver_string (drivers/base/core.c:2406)\n\tRead of size 8 at addr ffff888168e8a0b8 by task chaoskey_raw_re/10106\n\n\tHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n\tCall Trace:\n\t \u003cTASK\u003e\n\t dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\n\t print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n\t kasan_report (mm/kasan/report.c:595)\n\t dev_driver_string (drivers/base/core.c:2406)\n\t __dynamic_dev_dbg (lib/dynamic_debug.c:906)\n\t chaoskey_release (drivers/usb/misc/chaoskey.c:323)\n\t __fput (fs/file_table.c:510)\n\t fput_close_sync (fs/file_table.c:615)\n\t __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492)\n\t do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)\n\t entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nThe driver\u0027s last reference to the interface structure is dropped in\nthe chaoskey_free() routine, so the code must not use the interface --\neven in a debugging statement -- after that routine returns.\n(Exception: If we know that another reference is held by someone else,\nsuch as the device core while the disconnect routine runs, there\u0027s no\nproblem.  Thanks to Johan Hovold for pointing this out.)\n\nSince the bad access is part of an unimportant debugging statement,\nwe can fix the problem simply by removing the whole statement."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:23.952Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fe7a0f4be283b40dd592540027279735120d0d6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3e409476ad0703c54c14f245e4e143c8124e1bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c82f88bc7a8458d5c60f9b354c4d32d233f0cac"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a52d55c86a429dac47886b8424e67f90b001e67"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f50613bff228272577893aa10a346a2f3063e49"
        },
        {
          "url": "https://git.kernel.org/stable/c/abf76d3239dee97b66e7241ad04811f1ce562e28"
        }
      ],
      "title": "USB: chaoskey: Fix slab-use-after-free in chaoskey_release()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64455",
    "datePublished": "2026-07-25T08:51:23.952Z",
    "dateReserved": "2026-07-19T15:36:31.789Z",
    "dateUpdated": "2026-07-25T08:51:23.952Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-W6HM-PC27-4XCR

CVE-2026-64455 (GCVE-0-2026-64455)

Tags

Sightings

Nomenclature