CVE-2025-39813 (GCVE-0-2025-39813)
Vulnerability from cvelistv5
Published
2025-09-16 13:00
Modified
2025-09-29 05:59
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ftrace: Fix potential warning in trace_printk_seq during ftrace_dump
When calling ftrace_dump_one() concurrently with reading trace_pipe,
a WARN_ON_ONCE() in trace_printk_seq() can be triggered due to a race
condition.
The issue occurs because:
CPU0 (ftrace_dump) CPU1 (reader)
echo z > /proc/sysrq-trigger
!trace_empty(&iter)
trace_iterator_reset(&iter) <- len = size = 0
cat /sys/kernel/tracing/trace_pipe
trace_find_next_entry_inc(&iter)
__find_next_entry
ring_buffer_empty_cpu <- all empty
return NULL
trace_printk_seq(&iter.seq)
WARN_ON_ONCE(s->seq.len >= s->seq.size)
In the context between trace_empty() and trace_find_next_entry_inc()
during ftrace_dump, the ring buffer data was consumed by other readers.
This caused trace_find_next_entry_inc to return NULL, failing to populate
`iter.seq`. At this point, due to the prior trace_iterator_reset, both
`iter.seq.len` and `iter.seq.size` were set to 0. Since they are equal,
the WARN_ON_ONCE condition is triggered.
Move the trace_printk_seq() into the if block that checks to make sure the
return value of trace_find_next_entry_inc() is non-NULL in
ftrace_dump_one(), ensuring the 'iter.seq' is properly populated before
subsequent operations.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 Version: d769041f865330034131525ee6a7f72eb4af2a24 |
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|
|||||||||
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix potential warning in trace_printk_seq during ftrace_dump\n\nWhen calling ftrace_dump_one() concurrently with reading trace_pipe,\na WARN_ON_ONCE() in trace_printk_seq() can be triggered due to a race\ncondition.\n\nThe issue occurs because:\n\nCPU0 (ftrace_dump) CPU1 (reader)\necho z \u003e /proc/sysrq-trigger\n\n!trace_empty(\u0026iter)\ntrace_iterator_reset(\u0026iter) \u003c- len = size = 0\n cat /sys/kernel/tracing/trace_pipe\ntrace_find_next_entry_inc(\u0026iter)\n __find_next_entry\n ring_buffer_empty_cpu \u003c- all empty\n return NULL\n\ntrace_printk_seq(\u0026iter.seq)\n WARN_ON_ONCE(s-\u003eseq.len \u003e= s-\u003eseq.size)\n\nIn the context between trace_empty() and trace_find_next_entry_inc()\nduring ftrace_dump, the ring buffer data was consumed by other readers.\nThis caused trace_find_next_entry_inc to return NULL, failing to populate\n`iter.seq`. At this point, due to the prior trace_iterator_reset, both\n`iter.seq.len` and `iter.seq.size` were set to 0. Since they are equal,\nthe WARN_ON_ONCE condition is triggered.\n\nMove the trace_printk_seq() into the if block that checks to make sure the\nreturn value of trace_find_next_entry_inc() is non-NULL in\nftrace_dump_one(), ensuring the \u0027iter.seq\u0027 is properly populated before\nsubsequent operations."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-29T05:59:57.400Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"url": "https://git.kernel.org/stable/c/f299353e7ccbcc5c2ed8993c48fbe7609cbe729a"
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"url": "https://git.kernel.org/stable/c/a6f0f8873cc30fd4543b09adf03f7f51d293f0e6"
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"url": "https://git.kernel.org/stable/c/e80ff23ba8bdb0f41a1afe2657078e4097d13a9a"
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"url": "https://git.kernel.org/stable/c/28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa"
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"url": "https://git.kernel.org/stable/c/ced94e137e6cd5e79c65564841d3b7695d0f5fa3"
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{
"url": "https://git.kernel.org/stable/c/fbd4cf7ee4db65ef36796769fe978e9eba6f0de4"
},
{
"url": "https://git.kernel.org/stable/c/4013aef2ced9b756a410f50d12df9ebe6a883e4a"
}
],
"title": "ftrace: Fix potential warning in trace_printk_seq during ftrace_dump",
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"cveId": "CVE-2025-39813",
"datePublished": "2025-09-16T13:00:14.846Z",
"dateReserved": "2025-04-16T07:20:57.137Z",
"dateUpdated": "2025-09-29T05:59:57.400Z",
"state": "PUBLISHED"
},
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"nvd": "{\"cve\":{\"id\":\"CVE-2025-39813\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T13:15:55.150\",\"lastModified\":\"2025-09-18T13:43:34.310\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nftrace: Fix potential warning in trace_printk_seq during ftrace_dump\\n\\nWhen calling ftrace_dump_one() concurrently with reading trace_pipe,\\na WARN_ON_ONCE() in trace_printk_seq() can be triggered due to a race\\ncondition.\\n\\nThe issue occurs because:\\n\\nCPU0 (ftrace_dump) CPU1 (reader)\\necho z \u003e /proc/sysrq-trigger\\n\\n!trace_empty(\u0026iter)\\ntrace_iterator_reset(\u0026iter) \u003c- len = size = 0\\n cat /sys/kernel/tracing/trace_pipe\\ntrace_find_next_entry_inc(\u0026iter)\\n __find_next_entry\\n ring_buffer_empty_cpu \u003c- all empty\\n return NULL\\n\\ntrace_printk_seq(\u0026iter.seq)\\n WARN_ON_ONCE(s-\u003eseq.len \u003e= s-\u003eseq.size)\\n\\nIn the context between trace_empty() and trace_find_next_entry_inc()\\nduring ftrace_dump, the ring buffer data was consumed by other readers.\\nThis caused trace_find_next_entry_inc to return NULL, failing to populate\\n`iter.seq`. At this point, due to the prior trace_iterator_reset, both\\n`iter.seq.len` and `iter.seq.size` were set to 0. Since they are equal,\\nthe WARN_ON_ONCE condition is triggered.\\n\\nMove the trace_printk_seq() into the if block that checks to make sure the\\nreturn value of trace_find_next_entry_inc() is non-NULL in\\nftrace_dump_one(), ensuring the \u0027iter.seq\u0027 is properly populated before\\nsubsequent operations.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4013aef2ced9b756a410f50d12df9ebe6a883e4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6f0f8873cc30fd4543b09adf03f7f51d293f0e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ced94e137e6cd5e79c65564841d3b7695d0f5fa3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e80ff23ba8bdb0f41a1afe2657078e4097d13a9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f299353e7ccbcc5c2ed8993c48fbe7609cbe729a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbd4cf7ee4db65ef36796769fe978e9eba6f0de4\",\"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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