CVE-2026-90209
Full vulnerability record from the local CVENow database.
Description
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:17:16.060000
Last modified
2026-10-19 09:19:11.057000
View original CVE JSON
{
"id": "CVE-2026-90209",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-17T17:17:16.060",
"lastModified": "2026-10-19T09:19:11.057",
"vulnStatus": "Received",
"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 >.../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) ==> DEADLOCK\n\nFix this by splitting debug_unregister() into an s390dbf and debugfs\npart, and running only the s390dbf part with debug_mutex locked."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/s390/kernel/debug.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed",
"versionType": "git",
"status": "affected"
},
{
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "183f8f6d64bb0510070c856b9927618c53014a7b",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "a08b70ed2d1ec907353a72f15163b8e34ff4b2f8",
"versionType": "git",
"status": "affected"
},
{
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{
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"versionType": "git",
"status": "affected"
},
{
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"versionType": "git",
"status": "affected"
},
{
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"lessThan": "445c31ac638fd1af203d79bdf25fc0cb3149fbbc",
"versionType": "git",
"status": "affected"
},
{
"version": "c68ba4a708fbd0efdc384cd29250bb292a45e559",
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"status": "affected"
},
{
"version": "86f9980909f31ab205323eeeb290fe3cbb4952b4",
"versionType": "git",
"status": "affected"
},
{
"version": "fe5793e90d3f572a87ba67fe2f0e1679fdff14f8",
"versionType": "git",
"status": "affected"
},
{
"version": "e234f66168f0d50c0d28154fb983a14e85c3c526",
"versionType": "git",
"status": "affected"
},
{
"version": "5.4.146",
"lessThan": "5.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.10.65",
"lessThan": "5.11",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.13.17",
"lessThan": "5.14",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.14.4",
"lessThan": "5.15",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/s390/kernel/debug.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.15",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}