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CVE-2025-38539 (GCVE-0-2025-38539)

Vulnerability from cvelistv5 – Published: 2025-08-16 11:12 – Updated: 2026-08-05 12:02
VLAI
Title
tracing: Add down_write(trace_event_sem) when adding trace event
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Add down_write(trace_event_sem) when adding trace event When a module is loaded, it adds trace events defined by the module. It may also need to modify the modules trace printk formats to replace enum names with their values. If two modules are loaded at the same time, the adding of the event to the ftrace_events list can corrupt the walking of the list in the code that is modifying the printk format strings and crash the kernel. The addition of the event should take the trace_event_sem for write while it adds the new event. Also add a lockdep_assert_held() on that semaphore in __trace_add_event_dirs() as it iterates the list.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < e70f5ee4c8824736332351b703c46f9469ed7f6c (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < db45632479ceecb669612ed8dbce927e3c6279fc (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < ca60064ea03f14e06c763de018403cb56ba3207d (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < 7803b28c9aa8d8bd4e19ebcf5f0db9612b0f333b (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < 6bc94f20a4c304997288f9a45278c9d0c06987d3 (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < 33e20747b47ddc03569b6bc27a2d6894c1428182 (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < 70fecd519caad0c1741c3379d5348c9000a5b29d (git)
Affected: 110bf2b764eb6026b868d84499263cb24b1bcc8d , < b5e8acc14dcb314a9b61ff19dcd9fdd0d88f70df (git)
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Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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It\\nmay also need to modify the modules trace printk formats to replace enum\\nnames with their values.\\n\\nIf two modules are loaded at the same time, the adding of the event to the\\nftrace_events list can corrupt the walking of the list in the code that is\\nmodifying the printk format strings and crash the kernel.\\n\\nThe addition of the event should take the trace_event_sem for write while\\nit adds the new event.\\n\\nAlso add a lockdep_assert_held() on that semaphore in\\n__trace_add_event_dirs() as it iterates the list.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rastreo: Agregar down_write(trace_event_sem) al agregar un evento de rastreo Cuando se carga un m\u00f3dulo, agrega eventos de rastreo definidos por el m\u00f3dulo. Tambi\u00e9n puede necesitar modificar los formatos printk de rastreo de los m\u00f3dulos para reemplazar los nombres de enumeraci\u00f3n con sus valores. Si se cargan dos m\u00f3dulos al mismo tiempo, agregar el evento a la lista ftrace_events puede corromper el recorrido de la lista en el c\u00f3digo que modifica las cadenas de formato printk y bloquear el kernel. La adici\u00f3n del evento debe tomar trace_event_sem para escritura mientras agrega el nuevo evento. Tambi\u00e9n agregue un lockdep_assert_held() en ese sem\u00e1foro en __trace_add_event_dirs() mientras itera la lista.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"e70f5ee4c8824736332351b703c46f9469ed7f6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"db45632479ceecb669612ed8dbce927e3c6279fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"ca60064ea03f14e06c763de018403cb56ba3207d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"7803b28c9aa8d8bd4e19ebcf5f0db9612b0f333b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"6bc94f20a4c304997288f9a45278c9d0c06987d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"33e20747b47ddc03569b6bc27a2d6894c1428182\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"70fecd519caad0c1741c3379d5348c9000a5b29d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"110bf2b764eb6026b868d84499263cb24b1bcc8d\",\"lessThan\":\"b5e8acc14dcb314a9b61ff19dcd9fdd0d88f70df\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.31\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.31\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.147\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.100\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.40\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.8\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.31\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"8E758F3E-08FD-42F2-A3BC-48BED92149BF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-976C-463D0611F13F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.147\",\"matchCriteriaId\":\"A4FD62FC-0DAE-4ACE-8C9C-66156518C3E1\"},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List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:08:20+00:00",
      "cve": "CVE-2025-38539",
      "id": "CVE-2025-38539",
      "initial_release_date": "2025-08-16T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Add down_write(trace_event_sem) when adding trace event",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38539.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.