nvd-json-data-feeds/CVE-2024/CVE-2024-531xx/CVE-2024-53125.json

{
  "id": "CVE-2024-53125",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-12-04T14:15:20.460",
  "lastModified": "2024-12-19T19:15:07.613",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sync_linked_regs() must preserve subreg_def\n\nRange propagation must not affect subreg_def marks, otherwise the\nfollowing example is rewritten by verifier incorrectly when\nBPF_F_TEST_RND_HI32 flag is set:\n\n  0: call bpf_ktime_get_ns                   call bpf_ktime_get_ns\n  1: r0 &= 0x7fffffff       after verifier   r0 &= 0x7fffffff\n  2: w1 = w0                rewrites         w1 = w0\n  3: if w0 < 10 goto +0     -------------->  r11 = 0x2f5674a6     (r)\n  4: r1 >>= 32                               r11 <<= 32           (r)\n  5: r0 = r1                                 r1 |= r11            (r)\n  6: exit;                                   if w0 < 0xa goto pc+0\n                                             r1 >>= 32\n                                             r0 = r1\n                                             exit\n\n(or zero extension of w1 at (2) is missing for architectures that\n require zero extension for upper register half).\n\nThe following happens w/o this patch:\n- r0 is marked as not a subreg at (0);\n- w1 is marked as subreg at (2);\n- w1 subreg_def is overridden at (3) by copy_register_state();\n- w1 is read at (5) but mark_insn_zext() does not mark (2)\n  for zero extension, because w1 subreg_def is not set;\n- because of BPF_F_TEST_RND_HI32 flag verifier inserts random\n  value for hi32 bits of (2) (marked (r));\n- this random value is read at (5)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: sync_linked_regs() debe preservar subreg_def La propagaci\u00f3n del rango no debe afectar a las marcas subreg_def, de lo contrario el siguiente ejemplo es reescrito incorrectamente por el verificador cuando el indicador BPF_F_TEST_RND_HI32 est\u00e1 establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 &amp;= 0x7fffffff despu\u00e9s del verificador r0 &amp;= 0x7fffffff 2: w1 = w0 reescribe w1 = w0 3: si w0 &lt; 10 goto +0 --------------&gt; r11 = 0x2f5674a6 (r) 4: r1 &gt;&gt;= 32 r11 &lt;&lt;= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: salir; si w0 &lt; 0xa goto pc+0 r1 &gt;&gt;= 32 r0 = r1 salir (o falta la extensi\u00f3n cero de w1 en (2) para arquitecturas que requieren extensi\u00f3n cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 est\u00e1 marcado como no un subreg en (0); - w1 est\u00e1 marcado como subreg en (2); - el subreg_def de w1 es anulado en (3) por copy_register_state(); - w1 se lee en (5) pero mark_insn_zext() no marca (2) para extensi\u00f3n cero, porque el subreg_def de w1 no est\u00e1 configurado; - debido al indicador BPF_F_TEST_RND_HI32, el verificador inserta un valor aleatorio para los bits hi32 de (2) (marcado (r)); - este valor aleatorio se lee en (5)."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}