CVE-2025-39813
Estado: ModificadaMedia (4.7)—
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
In the context between trace_empty() and trace_find_next_entry_inc() during ftrace_dump, the ring buffer data was consumed by other readers.
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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.
Detalles técnicos trazas, registros y código del informe original
!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)CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 4.7
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-362
Referencias
- https://git.kernel.org/stable/c/28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa
- https://git.kernel.org/stable/c/4013aef2ced9b756a410f50d12df9ebe6a883e4a
- https://git.kernel.org/stable/c/5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85
- https://git.kernel.org/stable/c/a6f0f8873cc30fd4543b09adf03f7f51d293f0e6
- https://git.kernel.org/stable/c/ced94e137e6cd5e79c65564841d3b7695d0f5fa3
- https://git.kernel.org/stable/c/e80ff23ba8bdb0f41a1afe2657078e4097d13a9a
- https://git.kernel.org/stable/c/f299353e7ccbcc5c2ed8993c48fbe7609cbe729a
- https://git.kernel.org/stable/c/fbd4cf7ee4db65ef36796769fe978e9eba6f0de4
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
JSON original (NVD)
Mostrar
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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 > /proc/sysrq-trigger\n\n!trace_empty(&iter)\ntrace_iterator_reset(&iter) <- len = size = 0\n cat /sys/kernel/tracing/trace_pipe\ntrace_find_next_entry_inc(&iter)\n __find_next_entry\n ring_buffer_empty_cpu <- all empty\n return NULL\n\ntrace_printk_seq(&iter.seq)\n WARN_ON_ONCE(s->seq.len >= s->seq.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 'iter.seq' is properly populated before\nsubsequent operations."
}
],
"lastModified": "2026-06-17T09:18:32.050",
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