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CVE-2021-3489

Estado: ModificadaAlta (7.8)—

The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).

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 (2)

Canonical — Ubuntu LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-3489",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
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          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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  "published": "2021-06-04T02:15:07.047",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-119"
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  "descriptions": [
    {
      "lang": "en",
      "value": "The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee (\"bpf, ringbuf: Deny reserve of buffers larger than ringbuf\") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 (\"bpf: Implement BPF ring buffer and verifier support for it\") (v5.8-rc1)."
    },
    {
      "lang": "es",
      "value": "La función eBPF RINGBUF bpf_ringbuf_reserve() del kernel de Linux no comprobaba que el tamaño asignado fuera menor que el tamaño del ringbuf, lo que permitía a un atacante realizar escrituras fuera de los límites del kernel y, por tanto, la ejecución de código arbitrario. Este problema se solucionó a través del commit 4b81ccebaeee (\"bpf, ringbuf: Deny reserve of buffers larger than ringbuf\") (v5.13-rc4) y se retroalimentó a los kernels estables en versiones v5.12.4, v5.11.21 y v5.10.37. Se introdujo a través de 457f44363a88 (\"bpf: Implementar búfer de anillo BPF y soporte de verificador para ello\") (v5.8-rc1)"
    }
  ],
  "lastModified": "2026-06-17T04:05:11.590",
  "configurations": [
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