FKIE_CVE-2024-49850

Vulnerability from fkie_nvd - Published: 2024-10-21 13:15 - Updated: 2025-11-03 23:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos\n\nIn case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL\nreferencing a non-existing BTF type, function bpf_core_calc_relo_insn\nwould cause a null pointer deference.\n\nFix this by adding a proper check upper in call stack, as malformed\nrelocation records could be passed from user space.\n\nSimplest reproducer is a program:\n\n    r0 = 0\n    exit\n\nWith a single relocation record:\n\n    .insn_off = 0,          /* patch first instruction */\n    .type_id = 100500,      /* this type id does not exist */\n    .access_str_off = 6,    /* offset of string \"0\" */\n    .kind = BPF_CORE_TYPE_ID_LOCAL,\n\nSee the link for original reproducer or next commit for a test case."
    },
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: maneja correctamente reubicaciones BPF_CORE_TYPE_ID_LOCAL malformadas En caso de un registro de reubicaci\u00f3n malformado del tipo BPF_CORE_TYPE_ID_LOCAL que haga referencia a un tipo BTF inexistente, la funci\u00f3n bpf_core_calc_relo_insn causar\u00eda una desreferencia de puntero nulo. Solucione esto agregando una verificaci\u00f3n superior adecuada en la pila de llamadas, ya que los registros de reubicaci\u00f3n malformados podr\u00edan pasarse desde el espacio de usuario. El reproductor m\u00e1s simple es un programa: r0 = 0 exit Con un solo registro de reubicaci\u00f3n: .insn_off = 0, /* parchear la primera instrucci\u00f3n */ .type_id = 100500, /* este id de tipo no existe */ .access_str_off = 6, /* desplazamiento de la cadena \"0\" */ .kind = BPF_CORE_TYPE_ID_LOCAL, Consulte el enlace para el reproductor original o la pr\u00f3xima confirmaci\u00f3n para un caso de prueba."
    }
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  "id": "CVE-2024-49850",
  "lastModified": "2025-11-03T23:16:24.980",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "type": "Primary"
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  "published": "2024-10-21T13:15:05.797",
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  "vulnStatus": "Modified",
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}


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