CVE-2026-63802
Gravedad CVSS v3.1:
ALTA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
19/07/2026
Última modificación:
20/07/2026
Descripción
*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
blk-cgroup: fix UAF in __blkcg_rstat_flush()<br />
<br />
When multiple blkgs in the same blkcg are released concurrently,<br />
a use-after-free can occur. The race happens when one blkg&#39;s<br />
__blkcg_rstat_flush() removes another blkg&#39;s iostat entries via<br />
llist_del_all(). The second blkg sees an empty list and proceeds<br />
to free itself while the first is still iterating over its entries.<br />
<br />
Move the flush from __blkg_release() (RCU callback) to blkg_release()<br />
(before call_rcu). This ensures the RCU grace period waits for any<br />
concurrent flush&#39;s rcu_read_lock() section to complete before freeing.
Impacto
Puntuación base 3.x
7.80
Gravedad 3.x
ALTA
Referencias a soluciones, herramientas e información
- https://git.kernel.org/stable/c/0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2
- https://git.kernel.org/stable/c/5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6
- https://git.kernel.org/stable/c/96e545410c4f74c89d496c1d5d9ef8d08f14368b
- https://git.kernel.org/stable/c/afebe44facc48a61761e885bbb7f0380d4a603ec
- https://git.kernel.org/stable/c/bbebd9425cad3573d1527441753899b926525a0f