CVE-2025-39737 (GCVE-0-2025-39737)
Vulnerability from cvelistv5
Published
2025-09-11 16:52
Modified
2025-09-11 16:52
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()
A soft lockup warning was observed on a relative small system x86-64
system with 16 GB of memory when running a debug kernel with kmemleak
enabled.
watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134]
The test system was running a workload with hot unplug happening in
parallel. Then kemleak decided to disable itself due to its inability to
allocate more kmemleak objects. The debug kernel has its
CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000.
The soft lockup happened in kmemleak_do_cleanup() when the existing
kmemleak objects were being removed and deleted one-by-one in a loop via a
workqueue. In this particular case, there are at least 40,000 objects
that need to be processed and given the slowness of a debug kernel and the
fact that a raw_spinlock has to be acquired and released in
__delete_object(), it could take a while to properly handle all these
objects.
As kmemleak has been disabled in this case, the object removal and
deletion process can be further optimized as locking isn't really needed.
However, it is probably not worth the effort to optimize for such an edge
case that should rarely happen. So the simple solution is to call
cond_resched() at periodic interval in the iteration loop to avoid soft
lockup.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||||||
|
|||||||||
{
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"versions": [
{
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"status": "unaffected",
"version": "5.4.297",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.241",
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},
{
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"version": "5.15.190",
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},
{
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"version": "6.1.149",
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{
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"version": "6.6.103",
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},
{
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"version": "6.16.2",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()\n\nA soft lockup warning was observed on a relative small system x86-64\nsystem with 16 GB of memory when running a debug kernel with kmemleak\nenabled.\n\n watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134]\n\nThe test system was running a workload with hot unplug happening in\nparallel. Then kemleak decided to disable itself due to its inability to\nallocate more kmemleak objects. The debug kernel has its\nCONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000.\n\nThe soft lockup happened in kmemleak_do_cleanup() when the existing\nkmemleak objects were being removed and deleted one-by-one in a loop via a\nworkqueue. In this particular case, there are at least 40,000 objects\nthat need to be processed and given the slowness of a debug kernel and the\nfact that a raw_spinlock has to be acquired and released in\n__delete_object(), it could take a while to properly handle all these\nobjects.\n\nAs kmemleak has been disabled in this case, the object removal and\ndeletion process can be further optimized as locking isn\u0027t really needed. \nHowever, it is probably not worth the effort to optimize for such an edge\ncase that should rarely happen. So the simple solution is to call\ncond_resched() at periodic interval in the iteration loop to avoid soft\nlockup."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-11T16:52:12.519Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/9f1f4e95031f84867c5821540466d62f88dab8ca"
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"url": "https://git.kernel.org/stable/c/1ef72a7fedc5bca70e8cc980985790de10d407aa"
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{
"url": "https://git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2"
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"url": "https://git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4"
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"url": "https://git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b"
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"url": "https://git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d"
},
{
"url": "https://git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc"
}
],
"title": "mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()",
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"cveId": "CVE-2025-39737",
"datePublished": "2025-09-11T16:52:12.519Z",
"dateReserved": "2025-04-16T07:20:57.119Z",
"dateUpdated": "2025-09-11T16:52:12.519Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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"vulnerability-lookup:meta": {
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}
}
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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.
- 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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