CVE-2026-90209 (GCVE-0-2026-90209)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix deadlock during unregister Unregistering an s390dbf debug area while one of the associated debugfs files is being written to can cause a deadlock: $ echo >.../vmur/level $ rmmod vmur =================================================== debugfs write debugfs_file_get() debug_unregister() mutex_lock(debug_mutex) debugfs_remove() wait for debugfs_file_put() debug_file_ops.write() debug_input() mutex_lock(debug_mutex) ==> DEADLOCK Fix this by splitting debug_unregister() into an s390dbf and debugfs part, and running only the s390dbf part with debug_mutex locked.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: 9372a82892c2caa6bccab9a4081166fa769699f8
Version: c68ba4a708fbd0efdc384cd29250bb292a45e559
Version: 86f9980909f31ab205323eeeb290fe3cbb4952b4
Version: fe5793e90d3f572a87ba67fe2f0e1679fdff14f8
Version: e234f66168f0d50c0d28154fb983a14e85c3c526
Version: 5.4.146   ≤
Version: 5.10.65   ≤
Version: 5.13.17   ≤
Version: 5.14.4   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/debug: Fix deadlock during unregister\n\nUnregistering an s390dbf debug area while one of the associated debugfs\nfiles is being written to can cause a deadlock:\n\n$ echo \u003e.../vmur/level    $ rmmod vmur\n===================================================\ndebugfs write\ndebugfs_file_get()\n                          debug_unregister()\n                          mutex_lock(debug_mutex)\n                          debugfs_remove()\n                          wait for debugfs_file_put()\ndebug_file_ops.write()\ndebug_input()\nmutex_lock(debug_mutex) ==\u003e DEADLOCK\n\nFix this by splitting debug_unregister() into an s390dbf and debugfs\npart, and running only the s390dbf part with debug_mutex locked."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:59:45.470Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b"
        },
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          "url": "https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8"
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          "url": "https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba"
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          "url": "https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab"
        },
        {
          "url": "https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc"
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      ],
      "title": "s390/debug: Fix deadlock during unregister",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90209",
    "datePublished": "2026-09-17T16:07:24.126Z",
    "dateReserved": "2026-09-11T19:38:34.793Z",
    "dateUpdated": "2026-10-19T08:59:45.470Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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