FKIE_CVE-2026-90209

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kernel/debug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "183f8f6d64bb0510070c856b9927618c53014a7b",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "a08b70ed2d1ec907353a72f15163b8e34ff4b2f8",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "5d83f3faa3fb7f23f298cfd40382611999de5d1d",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "54e1259b75d6402a1d0cfb822b9bb2c507e53dab",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "lessThan": "445c31ac638fd1af203d79bdf25fc0cb3149fbbc",
              "status": "affected",
              "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c68ba4a708fbd0efdc384cd29250bb292a45e559",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "86f9980909f31ab205323eeeb290fe3cbb4952b4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fe5793e90d3f572a87ba67fe2f0e1679fdff14f8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e234f66168f0d50c0d28154fb983a14e85c3c526",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.146",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.65",
              "versionType": "semver"
            },
            {
              "lessThan": "5.14",
              "status": "affected",
              "version": "5.13.17",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15",
              "status": "affected",
              "version": "5.14.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kernel/debug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-90209",
  "lastModified": "2026-09-17T17:17:16.060",
  "metrics": {},
  "published": "2026-09-17T17:17:16.060",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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