{
  "id": "CVE-2024-26591",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-02-22T17:15:09.157",
  "lastModified": "2024-03-18T17:54:44.267",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix re-attachment branch in bpf_tracing_prog_attach\n\nThe following case can cause a crash due to missing attach_btf:\n\n1) load rawtp program\n2) load fentry program with rawtp as target_fd\n3) create tracing link for fentry program with target_fd = 0\n4) repeat 3\n\nIn the end we have:\n\n- prog->aux->dst_trampoline == NULL\n- tgt_prog == NULL (because we did not provide target_fd to link_create)\n- prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)\n- the program was loaded for tgt_prog but we have no way to find out which one\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000058\n    Call Trace:\n     <TASK>\n     ? __die+0x20/0x70\n     ? page_fault_oops+0x15b/0x430\n     ? fixup_exception+0x22/0x330\n     ? exc_page_fault+0x6f/0x170\n     ? asm_exc_page_fault+0x22/0x30\n     ? bpf_tracing_prog_attach+0x279/0x560\n     ? btf_obj_id+0x5/0x10\n     bpf_tracing_prog_attach+0x439/0x560\n     __sys_bpf+0x1cf4/0x2de0\n     __x64_sys_bpf+0x1c/0x30\n     do_syscall_64+0x41/0xf0\n     entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\nReturn -EINVAL in this situation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: Se corrigi\u00f3 la rama de re-adjunci\u00f3n en bpf_tracing_prog_attach El siguiente caso puede causar un bloqueo debido a la falta de adjunto_btf: 1) cargar el programa rawtp 2) cargar el programa fentry con rawtp como target_fd 3) crear enlace de seguimiento para el programa fentry con target_fd = 0 4) repetir 3 Al final tenemos: - prog-&gt;aux-&gt;dst_trampoline == NULL - tgt_prog == NULL (porque no proporcionamos target_fd para link_create) - prog-&gt;aux -&gt;attach_btf == NULL (el programa se carg\u00f3 con adjunto_prog_fd=X) - el programa se carg\u00f3 para tgt_prog pero no tenemos forma de averiguar cu\u00e1l ERROR: desreferencia del puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000058 Seguimiento de llamadas:  ? __morir+0x20/0x70 ? page_fault_oops+0x15b/0x430? fixup_exception+0x22/0x330? exc_page_fault+0x6f/0x170? asm_exc_page_fault+0x22/0x30? bpf_tracing_prog_attach+0x279/0x560? btf_obj_id+0x5/0x10 bpf_tracing_prog_attach+0x439/0x560 __sys_bpf+0x1cf4/0x2de0 __x64_sys_bpf+0x1c/0x30 do_syscall_64+0x41/0xf0 Entry_SYSCALL_64_after_hwframe+0x6e/ 0x76 Devuelve -EINVAL en esta situaci\u00f3n."
    }
  ],
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      {
        "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",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
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          "value": "CWE-476"
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