CVE-2025-38704
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access In the preparation stage of CPU online, if the corresponding the rdp's->nocb_cb_kthread does not exist, will be created, there is a situation where the rdp's rcuop kthreads creation fails, and then de-offload this CPU's rdp, does not assign this CPU's rdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and rdp's->rdp_gp->nocb_gp_kthread is still valid. This will cause the subsequent re-offload operation of this offline CPU, which will pass the conditional check and the kthread_unpark() will access invalid rdp's->nocb_cb_kthread pointer. This commit therefore use rdp's->nocb_gp_kthread instead of rdp_gp's->nocb_gp_kthread for safety check.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:39.263000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-38704",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-04T16:15:39.263",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access\n\nIn the preparation stage of CPU online, if the corresponding\nthe rdp's->nocb_cb_kthread does not exist, will be created,\nthere is a situation where the rdp's rcuop kthreads creation fails,\nand then de-offload this CPU's rdp, does not assign this CPU's\nrdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and\nrdp's->rdp_gp->nocb_gp_kthread is still valid.\n\nThis will cause the subsequent re-offload operation of this offline\nCPU, which will pass the conditional check and the kthread_unpark()\nwill access invalid rdp's->nocb_cb_kthread pointer.\n\nThis commit therefore use rdp's->nocb_gp_kthread instead of\nrdp_gp's->nocb_gp_kthread for safety check."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrcu/nocb: Corrección de posible acceso inválido al puntero rdp's->nocb_cb_kthread\n\nEn la etapa de preparación de CPU online, si el rdp's->nocb_cb_kthread correspondiente no existe, será creado, existe una situación en la que la creación de los kthreads rcuop del rdp falla, y luego se des-descarga el rdp de esta CPU, no asigna el puntero rdp->nocb_cb_kthread de esta CPU, pero este rdp's->nocb_gp_rdp y rdp's->rdp_gp->nocb_gp_kthread siguen siendo válidos.\n\nEsto causará la operación de re-descarga posterior de esta CPU offline, que pasará la verificación condicional y el kthread_unpark() accederá a un puntero rdp's->nocb_cb_kthread inválido.\n\nEste commit, por lo tanto, usa rdp's->nocb_gp_kthread en lugar de rdp_gp's->nocb_gp_kthread para la verificación de seguridad."
}
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