CVE-2025-39736 (GCVE-0-2025-39736)
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 deadlock by moving pr_warn() outside kmemleak_lock
When netpoll is enabled, calling pr_warn_once() while holding
kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock
inversion with the netconsole subsystem. This occurs because
pr_warn_once() may trigger netpoll, which eventually leads to
__alloc_skb() and back into kmemleak code, attempting to reacquire
kmemleak_lock.
This is the path for the deadlock.
mem_pool_alloc()
-> raw_spin_lock_irqsave(&kmemleak_lock, flags);
-> pr_warn_once()
-> netconsole subsystem
-> netpoll
-> __alloc_skb
-> __create_object
-> raw_spin_lock_irqsave(&kmemleak_lock, flags);
Fix this by setting a flag and issuing the pr_warn_once() after
kmemleak_lock is released.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 Version: c5665868183fec689dbab9fb8505188b2c4f0757 |
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|
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{
"containers": {
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"programFiles": [
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.4.297",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.241",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.149",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.43",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.15.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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{
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}
],
"negate": false,
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}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock\n\nWhen netpoll is enabled, calling pr_warn_once() while holding\nkmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock\ninversion with the netconsole subsystem. This occurs because\npr_warn_once() may trigger netpoll, which eventually leads to\n__alloc_skb() and back into kmemleak code, attempting to reacquire\nkmemleak_lock.\n\nThis is the path for the deadlock.\n\nmem_pool_alloc()\n -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n -\u003e pr_warn_once()\n -\u003e netconsole subsystem\n\t -\u003e netpoll\n\t -\u003e __alloc_skb\n\t\t -\u003e __create_object\n\t\t -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\n\nFix this by setting a flag and issuing the pr_warn_once() after\nkmemleak_lock is released."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-11T16:52:11.772Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a"
},
{
"url": "https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334"
},
{
"url": "https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b"
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{
"url": "https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac"
},
{
"url": "https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d"
},
{
"url": "https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350"
},
{
"url": "https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b"
},
{
"url": "https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f"
},
{
"url": "https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2"
}
],
"title": "mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock",
"x_generator": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2025-39736",
"datePublished": "2025-09-11T16:52:11.772Z",
"dateReserved": "2025-04-16T07:20:57.119Z",
"dateUpdated": "2025-09-11T16:52:11.772Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39736\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:34.840\",\"lastModified\":\"2025-09-15T15:22:38.297\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock\\n\\nWhen netpoll is enabled, calling pr_warn_once() while holding\\nkmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock\\ninversion with the netconsole subsystem. This occurs because\\npr_warn_once() may trigger netpoll, which eventually leads to\\n__alloc_skb() and back into kmemleak code, attempting to reacquire\\nkmemleak_lock.\\n\\nThis is the path for the deadlock.\\n\\nmem_pool_alloc()\\n -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\\n -\u003e pr_warn_once()\\n -\u003e netconsole subsystem\\n\\t -\u003e netpoll\\n\\t -\u003e __alloc_skb\\n\\t\\t -\u003e __create_object\\n\\t\\t -\u003e raw_spin_lock_irqsave(\u0026kmemleak_lock, flags);\\n\\nFix this by setting a flag and issuing the pr_warn_once() after\\nkmemleak_lock is released.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b\",\"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.
- 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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