CVE-2025-39689 (GCVE-0-2025-39689)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2026-10-15 22:02
VLAI
Title
ftrace: Also allocate and copy hash for reading of filter files
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:53 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < 12064e1880fc9202be75ff668205b1703d92f74f (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < c4cd93811e038d19f961985735ef7bb128078dfb (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < e0b6b223167e1edde5c82edf38e393c06eda1f13 (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309 (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < 3b114a3282ab1a12cb4618a8f45db5d7185e784a (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < c591ba1acd081d4980713e47869dd1cc3d963d19 (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < 64db338140d2bad99a0a8c6a118dd60b3e1fb8cb (git)
Affected: c20489dad156dd9919ebd854bbace46dbd2576a3 , < bfb336cf97df7b37b2b2edec0f69773e06d11955 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nftrace: Tambi\u00e9n asignar y copiar hash para la lectura de archivos de filtro\n\nActualmente, el lector de set_ftrace_filter y set_ftrace_notrace simplemente a\u00f1ade el puntero al hash global del trazador a su iterador. A diferencia del escritor que asigna una copia del hash, el lector mantiene el puntero a los hashes de filtro. Esto es problem\u00e1tico porque este puntero es est\u00e1tico a trav\u00e9s de las llamadas a funciones que liberan los bloqueos que pueden actualizar los hashes globales del trazador. Esto puede causar UAF y errores similares.\n\nAsignar y copiar el hash para leer los archivos de filtro como se hace para los escritores. Esto no solo corrige errores de UAF, sino que tambi\u00e9n simplifica un poco el c\u00f3digo, ya que no tiene que diferenciar cu\u00e1ndo liberar el hash del iterador entre escritores y lectores."
          }
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      "current_release_date": "2026-10-16T22:56:04+00:00",
      "cve": "CVE-2025-39689",
      "id": "CVE-2025-39689",
      "initial_release_date": "2025-09-05T00:00:00+00:00",
      "product_status:known_affected": "247",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ftrace: Also allocate and copy hash for reading of filter files",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39689.json",
      "version": "3"
    }
  }
}



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