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CVE-2026-64069

Estado: AnalizadaCrítica (9.8)—

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

netfs: Fix cancellation of a DIO and single read subrequests

When the preparation of a new subrequest for a read fails, if the subrequest has already been added to the stream->subrequests list, it can't simply be put and abandoned as the collector may see it. Also, if it hasn't been queued yet, it has two outstanding refs that both need to be put. Both DIO read and single-read dispatch fail at this; further, both differ in the order they do things to the way buffered read works.

Fix cancellation of both DIO-read and single-read subrequests that failed preparation by the following steps:

Leer descripción completaMostrar menos

(2) Make all three call netfs_queue_read() to do the queuing.

Detalles técnicos trazas, registros y código del informe original
 (1) Harmonise all three reads (buffered, dio, single) to queue the subreq
     before prepping it.

 (3) Set NETFS_RREQ_ALL_QUEUED independently of the queuing as we don't
     know the length of the subreq at this point.

 (4) In all cases, set the error and NETFS_SREQ_FAILED flag on the subreq
     and then call netfs_read_subreq_terminated() to deal with it.  This
     will pass responsibility off to the collector for dealing with it.

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.

Vector CVSS AV:N/AC:L/PR:N/UI:N con acceso de red sin autenticación sugiere T1190. La descripción de corrupción de memoria en kernel (CWE-125, buffer over-read) y el impacto C:H/I:H/A:H indica ejecución de código arbitrario (T1059).

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix cancellation of a DIO and single read subrequests\n\nWhen the preparation of a new subrequest for a read fails, if the\nsubrequest has already been added to the stream->subrequests list, it can't\nsimply be put and abandoned as the collector may see it.  Also, if it\nhasn't been queued yet, it has two outstanding refs that both need to be\nput.  Both DIO read and single-read dispatch fail at this; further, both\ndiffer in the order they do things to the way buffered read works.\n\nFix cancellation of both DIO-read and single-read subrequests that failed\npreparation by the following steps:\n\n (1) Harmonise all three reads (buffered, dio, single) to queue the subreq\n     before prepping it.\n\n (2) Make all three call netfs_queue_read() to do the queuing.\n\n (3) Set NETFS_RREQ_ALL_QUEUED independently of the queuing as we don't\n     know the length of the subreq at this point.\n\n (4) In all cases, set the error and NETFS_SREQ_FAILED flag on the subreq\n     and then call netfs_read_subreq_terminated() to deal with it.  This\n     will pass responsibility off to the collector for dealing with it."
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