CVE-2025-40196
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: fs: quota: create dedicated workqueue for quota_release_work There is a kernel panic due to WARN_ONCE when panic_on_warn is set. This issue occurs when writeback is triggered due to sync call for an opened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance is needed at sync path, flush for quota_release_work is triggered. By default quota_release_work is queued to "events_unbound" queue which does not have WQ_MEM_RECLAIM flag. During f2fs balance "writeback" workqueue tries to flush quota_release_work causing kernel panic due to MEM_RECLAIM flag mismatch errors. This patch creates dedicated workqueue with WQ_MEM_RECLAIM flag for work quota_release_work. ------------[ cut here ]------------ WARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148 Call trace: check_flush_dependency+0x13c/0x148 __flush_work+0xd0/0x398 flush_delayed_work+0x44/0x5c dquot_writeback_dquots+0x54/0x318 f2fs_do_quota_sync+0xb8/0x1a8 f2fs_write_checkpoint+0x3cc/0x99c f2fs_gc+0x190/0x750 f2fs_balance_fs+0x110/0x168 f2fs_write_single_data_page+0x474/0x7dc f2fs_write_data_pages+0x7d0/0xd0c do_writepages+0xe0/0x2f4 __writeback_single_inode+0x44/0x4ac writeback_sb_inodes+0x30c/0x538 wb_writeback+0xf4/0x440 wb_workfn+0x128/0x5d4 process_scheduled_works+0x1c4/0x45c worker_thread+0x32c/0x3e8 kthread+0x11c/0x1b0 ret_from_fork+0x10/0x20 Kernel panic - not syncing: kernel: panic_on_warn set ...
Severity
Not scored
CVSS score
Not available
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-11-12 22:15:46.673000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-40196",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-11-12T22:15:46.673",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: quota: create dedicated workqueue for quota_release_work\n\nThere is a kernel panic due to WARN_ONCE when panic_on_warn is set.\n\nThis issue occurs when writeback is triggered due to sync call for an\nopened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance\nis needed at sync path, flush for quota_release_work is triggered.\nBy default quota_release_work is queued to \"events_unbound\" queue which\ndoes not have WQ_MEM_RECLAIM flag. During f2fs balance \"writeback\"\nworkqueue tries to flush quota_release_work causing kernel panic due to\nMEM_RECLAIM flag mismatch errors.\n\nThis patch creates dedicated workqueue with WQ_MEM_RECLAIM flag\nfor work quota_release_work.\n\n------------[ cut here ]------------\nWARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148\nCall trace:\n check_flush_dependency+0x13c/0x148\n __flush_work+0xd0/0x398\n flush_delayed_work+0x44/0x5c\n dquot_writeback_dquots+0x54/0x318\n f2fs_do_quota_sync+0xb8/0x1a8\n f2fs_write_checkpoint+0x3cc/0x99c\n f2fs_gc+0x190/0x750\n f2fs_balance_fs+0x110/0x168\n f2fs_write_single_data_page+0x474/0x7dc\n f2fs_write_data_pages+0x7d0/0xd0c\n do_writepages+0xe0/0x2f4\n __writeback_single_inode+0x44/0x4ac\n writeback_sb_inodes+0x30c/0x538\n wb_writeback+0xf4/0x440\n wb_workfn+0x128/0x5d4\n process_scheduled_works+0x1c4/0x45c\n worker_thread+0x32c/0x3e8\n kthread+0x11c/0x1b0\n ret_from_fork+0x10/0x20\nKernel panic - not syncing: kernel: panic_on_warn set ..."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: cuota: crear cola de trabajo dedicada para quota_release_work\n\nHay un pánico del kernel debido a WARN_ONCE cuando panic_on_warn está configurado.\n\nEste problema ocurre cuando se activa la escritura diferida debido a una llamada de sincronización para un archivo abierto (es decir, la razón de la escritura diferida es WB_REASON_SYNC). Cuando se necesita el balanceo de f2fs en la ruta de sincronización, se activa el vaciado para quota_release_work. Por defecto, quota_release_work se encola en la cola “events_unbound” que no tiene la bandera WQ_MEM_RECLAIM. Durante el balanceo de f2fs, la cola de trabajo “writeback” intenta vaciar quota_release_work, causando un pánico del kernel debido a errores de falta de coincidencia de la bandera MEM_RECLAIM.\n\nEste parche crea una cola de trabajo dedicada con la bandera WQ_MEM_RECLAIM para el trabajo quota_release_work.\n\n------------[ cortar aquí ]------------\nADVERTENCIA: CPU: 4 PID: 14867 en kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148\nRastro de llamada:\n check_flush_dependency+0x13c/0x148\n __flush_work+0xd0/0x398\n flush_delayed_work+0x44/0x5c\n dquot_writeback_dquots+0x54/0x318\n f2fs_do_quota_sync+0xb8/0x1a8\n f2fs_write_checkpoint+0x3cc/0x99c\n f2fs_gc+0x190/0x750\n f2fs_balance_fs+0x110/0x168\n f2fs_write_single_data_page+0x474/0x7dc\n f2fs_write_data_pages+0x7d0/0xd0c\n do_writepages+0xe0/0x2f4\n __writeback_single_inode+0x44/0x4ac\n writeback_sb_inodes+0x30c/0x538\n wb_writeback+0xf4/0x440\n wb_workfn+0x128/0x5d4\n process_scheduled_works+0x1c4/0x45c\n worker_thread+0x32c/0x3e8\n kthread+0x11c/0x1b0\n ret_from_fork+0x10/0x20\nPánico del kernel - no sincronizando: kernel: panic_on_warn configurado ..."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/quota/dquot.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb",
"lessThan": "8df2eedd371a1c24ecc4283581299d7737dfcd06",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "f846eacde280ecc3daedfe001580e3033565179e",
"versionType": "git",
"status": "affected"
},
{
"version": "8ea87e34792258825d290f4dc5216276e91cb224",
"lessThan": "f12039df1515d5daf7d92e586ece5cefeb39561b",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0",
"versionType": "git",
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},
{
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"lessThan": "72b7ceca857f38a8ca7c5629feffc63769638974",
"versionType": "git",
"status": "affected"
},
{
"version": "a5abba5e0e586e258ded3e798fe5f69c66fec198",
"versionType": "git",
"status": "affected"
},
{
"version": "6f3821acd7c3143145999248087de5fb4b48cf26",
"versionType": "git",
"status": "affected"
},
{
"version": "ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb",
"versionType": "git",
"status": "affected"
},
{
"version": "6.1.120",
"lessThan": "6.1.178",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.64",
"lessThan": "6.6.114",
"versionType": "semver",
"status": "affected"
},
{
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"versionType": "semver",
"status": "affected"
},
{
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"versionType": "semver",
"status": "affected"
},
{
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},
{
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"lessThan": "5.16",
"versionType": "semver",
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}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/quota/dquot.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
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"status": "affected"
},
{
"version": "0",
"lessThan": "6.13",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.178",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.114",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.54",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.4",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"defaultStatus": "unknown",
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"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom",
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}
]
},
{
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{
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"lessThan": "*",
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}
]
},
{
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"lessThan": "*",
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]
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{
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"lessThan": "*",
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]
},
{
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}
]
}
]
}
],
"metrics": {},
"references": [
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}