fkie_cve-2023-4208
Vulnerability from fkie_nvd
Published
2023-09-06 14:15
Modified
2025-02-13 17:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.
References
cve-coordination@google.comhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81Vendor Advisory
cve-coordination@google.comhttps://kernel.dance/3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81Vendor Advisory
cve-coordination@google.comhttps://lists.debian.org/debian-lts-announce/2024/01/msg00004.htmlThird Party Advisory
cve-coordination@google.comhttps://www.debian.org/security/2023/dsa-5492Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://kernel.dance/3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/01/msg00004.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5492Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 12.0


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A use-after-free vulnerability in the Linux kernel\u0027s net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\nWhen u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.\n\nWe recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Use After Free en el componente net/sched: cls_u32 del kernel de Linux puede ser explotada para conseguir una escalada local de privilegios. Cuando se llama a u32_change() en un filtro existente, toda la estructura tcf_result se copia siempre en la nueva instancia del filtro. Esto causa un problema cuando se actualiza un filtro vinculado a una clase, ya que tcf_unbind_filter() siempre llama a la instancia antigua en la ruta de \u00e9xito, disminuyendo filter_cnt de la clase a\u00fan referenciada y permitiendo que se elimine, lo que lleva a un Use After Free. Recomendamos actualizar el commit a partir de 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81."
    }
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  "id": "CVE-2023-4208",
  "lastModified": "2025-02-13T17:17:16.517",
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          "confidentialityImpact": "HIGH",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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  "published": "2023-09-06T14:15:11.627",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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}


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