CVE-2025-39813

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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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace.c"], "versions": [{"version": "d769041f865330034131525ee6a7f72eb4af2a24", "lessThan": "f299353e7ccbcc5c2ed8993c48fbe7609cbe729a", "status": "affected", "versionType": "git"}, {"version": "d769041f865330034131525ee6a7f72eb4af2a24", "lessThan": "5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85", "status": "affected", "versionType": "git"}, {"version": "d769041f865330034131525ee6a7f72eb4af2a24", "lessThan": "a6f0f8873cc30fd4543b09adf03f7f51d293f0e6", "status": "affected", "versionType": "git"}, {"version": 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"defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f299353e7ccbcc5c2ed8993c48fbe7609cbe729a"}, {"url": "https://git.kernel.org/stable/c/5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85"}, {"url": "https://git.kernel.org/stable/c/a6f0f8873cc30fd4543b09adf03f7f51d293f0e6"}, {"url": "https://git.kernel.org/stable/c/e80ff23ba8bdb0f41a1afe2657078e4097d13a9a"}, {"url": "https://git.kernel.org/stable/c/28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa"}, {"url": "https://git.kernel.org/stable/c/ced94e137e6cd5e79c65564841d3b7695d0f5fa3"}, {"url": "https://git.kernel.org/stable/c/fbd4cf7ee4db65ef36796769fe978e9eba6f0de4"}, {"url": "https://git.kernel.org/stable/c/4013aef2ced9b756a410f50d12df9ebe6a883e4a"}], "x_generator": {"engine": "bippy-1.2.0"}, "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 > /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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.298", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.242", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.191", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.150", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.104", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.45", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.5", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "2.6.28"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:36:50.968Z"}}}, "cveMetadata": {"cveId": "CVE-2025-39813", "state": "PUBLISHED", "dateUpdated": "2026-11-05T21:12:59.108Z", "dateReserved": "2025-04-16T07:20:57.137Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-16T13:00:14.846Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"operator": "OR"}]}], "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 > /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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nftrace: Soluciona una advertencia potencial en trace_printk_seq durante ftrace_dump\n\nAl llamar a ftrace_dump_one() concurrentemente con la lectura de trace_pipe, una WARN_ON_ONCE() en trace_printk_seq() puede ser activada debido a una condici\u00f3n de carrera.\n\nEl problema ocurre porque:\n\nCPU0 (ftrace_dump) CPU1 (lector)\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 <- todo vac\u00edo\n return NULL\n\ntrace_printk_seq(&iter.seq)\n WARN_ON_ONCE(s->seq.len >= s->seq.size)\n\nEn el contexto entre trace_empty() y trace_find_next_entry_inc() durante ftrace_dump, los datos del b\u00fafer circular fueron consumidos por otros lectores. Esto hizo que trace_find_next_entry_inc devolviera NULL, fallando en poblar 'iter.seq'. En este punto, debido al trace_iterator_reset previo, tanto 'iter.seq.len' como 'iter.seq.size' se establecieron en 0. Dado que son iguales, la condici\u00f3n WARN_ON_ONCE se activa.\n\nMover trace_printk_seq() al bloque 'if' que verifica que el valor de retorno de trace_find_next_entry_inc() no sea NULL en ftrace_dump_one(), asegurando que 'iter.seq' se pueble correctamente antes de operaciones posteriores."}], "id": "CVE-2025-39813", "lastModified": "2026-11-05T22:17:32.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39813", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:12:05.539187Z", "version": "2.0.3"}}]}, "published": "2025-09-16T13:15:55.150", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4013aef2ced9b756a410f50d12df9ebe6a883e4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a6f0f8873cc30fd4543b09adf03f7f51d293f0e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ced94e137e6cd5e79c65564841d3b7695d0f5fa3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e80ff23ba8bdb0f41a1afe2657078e4097d13a9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f299353e7ccbcc5c2ed8993c48fbe7609cbe729a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbd4cf7ee4db65ef36796769fe978e9eba6f0de4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ftrace: Fix potential warning in trace_printk_seq during ftrace_dump", "id": "2395791", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395791"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39813", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39813\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39813\nhttps://lore.kernel.org/linux-cve-announce/2025091614-CVE-2025-39813-295c@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-17T10:04:26.395627+00:00", "updated": "2025-09-17T10:04:26.395669+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}