CVE-2026-99280 Uso después de liberar en ksmbd del kernel Linux por lectores de procfs

Afectados

• Linux

  desde d7fd1f98607f2cd358e583f9548bdf0173090a86 hasta antes de 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2cdesde d7fd1f98607f2cd358e583f9548bdf0173090a86 hasta antes de 1c087cf7d5386c708d8984b263280b42b3daada0c99ea7855124ca1428a1e59c2b4590aaef34eacfdesde 7.2.8 hasta antes de 7.3

• Linux

  7.3

Qué hacer

1. Verificá si usás Linux y en qué versión.
2. Actualizá a la versión corregida que indique el fabricante en su aviso o aplicá su mitigación.
3. Revisá registros y accesos de los sistemas expuestos para descartar un uso previo.

Calculadora CVSS

Esta vulnerabilidad todavía no tiene vector CVSS publicado.

Descripción original

In the Linux kernel, the following vulnerability has been resolved: ksmbd: drain session procfs readers before dropping table references Session registration failure and connection cleanup can drop the table reference while the per-session procfs entry is still accessible. If a reader holds the last remaining reference, its final put calls proc_remove() from its own callback and waits for that callback to finish. Remove the procfs entry before dropping the table reference in the registration failure path. Queue sessions removed during connection cleanup and drain their procfs readers after releasing both session locks, then return their table references. Keep the global hash node unhashed while a session is queued so a concurrent unregister cannot drop the reference again. Previous-session replacement also destroys the file table before the session is finally freed. Detach the idr under the lock used by procfs file counters, and report zero files after it has been detached. This prevents a reader from accessing the idr during or after its destruction.

Referencias (2)

• git.kernel.org/stable/c/6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c
• git.kernel.org/stable/c/1c087cf7d5386c708d8984b263280b42b3daada0

Resumen traducido automáticamente de la descripción original. Fuente: Nureq Monitor. Cómo funciona.