CVE-2025-40196 (GCVE-0-2025-40196)
Vulnerability from cvelistv5
Published
2025-11-12 21:56
Modified
2025-11-12 21:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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 ...
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: bcacb52a985f1b6d280f698a470b873dfe52728a Version: 8ea87e34792258825d290f4dc5216276e91cb224 Version: ac6f420291b3fee1113f21d612fa88b628afab5b Version: ac6f420291b3fee1113f21d612fa88b628afab5b Version: a5abba5e0e586e258ded3e798fe5f69c66fec198 Version: 6f3821acd7c3143145999248087de5fb4b48cf26 Version: ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb Version: 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/quota/dquot.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
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"product": "Linux",
"programFiles": [
"fs/quota/dquot.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "6.13"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
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"versionStartIncluding": "6.6.64",
"vulnerable": true
},
{
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},
{
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{
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{
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],
"negate": false,
"operator": "OR"
}
]
}
],
"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 ..."
}
],
"providerMetadata": {
"dateUpdated": "2025-11-12T21:56:32.578Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f846eacde280ecc3daedfe001580e3033565179e"
},
{
"url": "https://git.kernel.org/stable/c/f12039df1515d5daf7d92e586ece5cefeb39561b"
},
{
"url": "https://git.kernel.org/stable/c/8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0"
},
{
"url": "https://git.kernel.org/stable/c/72b7ceca857f38a8ca7c5629feffc63769638974"
}
],
"title": "fs: quota: create dedicated workqueue for quota_release_work",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40196",
"datePublished": "2025-11-12T21:56:32.578Z",
"dateReserved": "2025-04-16T07:20:57.178Z",
"dateUpdated": "2025-11-12T21:56:32.578Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-40196\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T22:15:46.673\",\"lastModified\":\"2025-11-14T16:42:30.503\",\"vulnStatus\":\"Awaiting Analysis\",\"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 ...\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/72b7ceca857f38a8ca7c5629feffc63769638974\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f12039df1515d5daf7d92e586ece5cefeb39561b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f846eacde280ecc3daedfe001580e3033565179e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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