s390/debug: Fix deadlock during unregister
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.
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"
},
{
"status": "affected",
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "a08b70ed2d1ec907353a72f15163b8e34ff4b2f8",
"versionType": "git"
},
{
"status": "affected",
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba",
"versionType": "git"
},
{
"status": "affected",
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "5d83f3faa3fb7f23f298cfd40382611999de5d1d",
"versionType": "git"
},
{
"status": "affected",
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "54e1259b75d6402a1d0cfb822b9bb2c507e53dab",
"versionType": "git"
},
{
"status": "affected",
"version": "9372a82892c2caa6bccab9a4081166fa769699f8",
"lessThan": "445c31ac638fd1af203d79bdf25fc0cb3149fbbc",
"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"
},
{
"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"
}
],
"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
- Added to Heist Feed
- Publisher date