CVE-2026-98082

Estado: AnalizadaMedia (5.5)—

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

btrfs: fix the possible bioc_list memory leak during error

There are two possible ways to leak bioc memory on btrfs_ordered_extent::bioc_list:

Fix the problem by:

This was reported by Sashiko when reviewing another patch.

Detalles técnicos trazas, registros y código del informe original

- An error occurred for btrfs_insert_one_raid_extent()
  Then the function btrfs_insert_raid_extent() immediately return
  without freeing any bioc in the bioc_list.

- An ordered extent hit an IO error
  In that case the ordered extent will have BTRFS_ORDERED_IOERR set, and
  skip the call on btrfs_insert_raid_extent() completely.

- Introduce a new helper, btrfs_cleanup_ordered_bioc_list()
  Which will remove all bioc from the bioc_list, and release the bioc.

- Call the above helper for btrfs_insert_raid_extent()
  So that the cleanup helper is always called no matter what.

- Call the above helper for btrfs_finish_one_ordered()
  This is called just before the final release on the ordered extent.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact80 %

Vulnerabilidad local (AV:L, PR:L) en kernel Linux que causa fuga de memoria y negación de servicio por error de manejo de recursos (CWE-401), explotable por usuario local para degradar disponibilidad del sistema.

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

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-401

Referencias

JSON original (NVD)

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