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s390/debug: Fix deadlock during unregister

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90209

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90209

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
        "lessThan": "a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9372a82892c2caa6bccab9a4081166fa769699f8",
        "lessThan": "183f8f6d64bb0510070c856b9927618c53014a7b",
        "versionType": "git"
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        "versionType": "git"
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        "version": "86f9980909f31ab205323eeeb290fe3cbb4952b4",
        "versionType": "git"
      },
      {
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        "version": "fe5793e90d3f572a87ba67fe2f0e1679fdff14f8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e234f66168f0d50c0d28154fb983a14e85c3c526",
        "versionType": "git"
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      {
        "status": "affected",
        "version": "5.4.146",
        "lessThan": "5.5",
        "versionType": "semver"
      },
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        "status": "affected",
        "version": "5.10.65",
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      },
      {
        "status": "affected",
        "version": "5.13.17",
        "lessThan": "5.14",
        "versionType": "semver"
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      {
        "status": "affected",
        "version": "5.14.4",
        "lessThan": "5.15",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "arch/s390/kernel/debug.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/s390/kernel/debug.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90209

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36582 · Revision 1
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Publisher date
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