CVE-2024-26739

Estado: ModificadaAlta (7.8)—
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: act_mirred: no anula retval si ya perdimos el skb. Si estamos redirigiendo el skb y aún no hemos llamado a tcf_mirred_forward(), necesitamos para decirle al núcleo que suelte el skb configurando el código de retección en SHOT. Sin embargo, si hemos llamado a tcf_mirred_forward(), el skb está fuera de nuestras manos y devolver SHOT conducirá a UaF. Mueva la anulación de recuperación a la ruta de error que realmente la necesita.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.28%
Percentil entre todas las CVEs puntuadas: 19
Fecha de la puntuación: 8/10/2026
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)

Debian — Debian Linux Linux — Linux Kernel
CWE

CWE-416
Referencias

JSON original (NVD)

Mostrar
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          "value": "CWE-416"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mirred: don't override retval if we already lost the skb\n\nIf we're redirecting the skb, and haven't called tcf_mirred_forward(),\nyet, we need to tell the core to drop the skb by setting the retcode\nto SHOT. If we have called tcf_mirred_forward(), however, the skb\nis out of our hands and returning SHOT will lead to UaF.\n\nMove the retval override to the error path which actually need it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: act_mirred: no anula retval si ya perdimos el skb. Si estamos redirigiendo el skb y aún no hemos llamado a tcf_mirred_forward(), necesitamos para decirle al núcleo que suelte el skb configurando el código de retección en SHOT. Sin embargo, si hemos llamado a tcf_mirred_forward(), el skb está fuera de nuestras manos y devolver SHOT conducirá a UaF. Mueva la anulación de recuperación a la ruta de error que realmente la necesita."
    }
  ],
  "lastModified": "2026-08-04T11:17:00.353",
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