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CVE-2024-53125

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

bpf: sync_linked_regs() must preserve subreg_def

Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set:

(or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half).

Detalles técnicos trazas, registros y código del informe original
  0: call bpf_ktime_get_ns                   call bpf_ktime_get_ns
  1: r0 &= 0x7fffffff       after verifier   r0 &= 0x7fffffff
  2: w1 = w0                rewrites         w1 = w0
  3: if w0 < 10 goto +0     -------------->  r11 = 0x2f5674a6     (r)
  4: r1 >>= 32                               r11 <<= 32           (r)
  5: r0 = r1                                 r1 |= r11            (r)
  6: exit;                                   if w0 < 0xa goto pc+0
                                             r1 >>= 32
                                             r0 = r1
                                             exit

The following happens w/o this patch:
- r0 is marked as not a subreg at (0);
- w1 is marked as subreg at (2);
- w1 subreg_def is overridden at (3) by copy_register_state();
- w1 is read at (5) but mark_insn_zext() does not mark (2)
  for zero extension, because w1 subreg_def is not set;
- because of BPF_F_TEST_RND_HI32 flag verifier inserts random
  value for hi32 bits of (2) (marked (r));
- this random value is read at (5).

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "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 propagación 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 está establecido: 0: llamar a bpf_ktime_get_ns llamar a bpf_ktime_get_ns 1: r0 &amp;= 0x7fffffff después 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 extensión cero de w1 en (2) para arquitecturas que requieren extensión cero para la mitad superior del registro). Lo siguiente ocurre sin este parche: - r0 está marcado como no un subreg en (0); - w1 está 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 extensión cero, porque el subreg_def de w1 no está 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)."
    }
  ],
  "lastModified": "2026-08-04T11:21:56.240",
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