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CVE-2025-38538

Estado: AnalizadaAlta (7.8)—

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

dmaengine: nbpfaxi: Fix memory corruption in probe()

The nbpf->chan[] array is allocated earlier in the nbpf_probe() function and it has "num_channels" elements. These three loops iterate one element farther than they should and corrupt memory.

The changes to the second loop are more involved. In this case, we're copying data from the irqbuf[] array into the nbpf->chan[] array. If the data in irqbuf[i] is the error IRQ then we skip it, so the iterators are not in sync. I added a check to ensure that we don't go beyond the end of the irqbuf[] array. I'm pretty sure this can't happen, but it seemed harmless to add a check.

Leer descripción completaMostrar menos

On the other hand, after the loop has ended there is a check to ensure that the "chan" iterator is where we expect it to be. In the original code we went one element beyond the end of the array so the iterator wasn't in the correct place and it would always return -EINVAL. However, now it will always be in the correct place. I deleted the check since we know the result.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CWE-787 (buffer overflow) en kernel local (AV:L, PR:L, sin UI) permite corrupción de memoria que derivaría en ejecución de código o manipulación de datos con privilegios escalados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: nbpfaxi: Fix memory corruption in probe()\n\nThe nbpf->chan[] array is allocated earlier in the nbpf_probe() function\nand it has \"num_channels\" elements.  These three loops iterate one\nelement farther than they should and corrupt memory.\n\nThe changes to the second loop are more involved.  In this case, we're\ncopying data from the irqbuf[] array into the nbpf->chan[] array.  If\nthe data in irqbuf[i] is the error IRQ then we skip it, so the iterators\nare not in sync.  I added a check to ensure that we don't go beyond the\nend of the irqbuf[] array.  I'm pretty sure this can't happen, but it\nseemed harmless to add a check.\n\nOn the other hand, after the loop has ended there is a check to ensure\nthat the \"chan\" iterator is where we expect it to be.  In the original\ncode we went one element beyond the end of the array so the iterator\nwasn't in the correct place and it would always return -EINVAL.  However,\nnow it will always be in the correct place.  I deleted the check since\nwe know the result."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dmaengine: nbpfaxi: Corrección de corrupción de memoria en probe(). La matriz nbpf->chan[] se asigna antes en la función nbpf_probe() y contiene elementos \"num_channels\". Estos tres bucles iteran un elemento más allá de lo debido y corrompen la memoria. Los cambios en el segundo bucle son más complejos. En este caso, copiamos datos de la matriz irqbuf[] a la matriz nbpf->chan[]. Si los datos en irqbuf[i] corresponden a la IRQ de error, la omitimos, por lo que los iteradores no están sincronizados. Añadí una comprobación para asegurar que no se sobrepase el final de la matriz irqbuf[]. Estoy bastante seguro de que esto no puede ocurrir, pero añadir una comprobación parecía inofensivo. Por otro lado, una vez finalizado el bucle, se realiza una comprobación para asegurar que el iterador \"chan\" esté donde esperamos. En el código original, nos extendimos un elemento más allá del final del array, por lo que el iterador no estaba en la posición correcta y siempre devolvía -EINVAL. Sin embargo, ahora siempre estará en la posición correcta. Eliminé la comprobación, ya que conocemos el resultado."
    }
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