CVE-2026-46259
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat() When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- do_task_stat var = task->real_parent release_task call_rcu(delayed_put_task_struct) task_tgid_nr_ns(var) rcu_read_lock <--- Too late to protect task->real_parent! task_pid_ptr <--- UAF! rcu_read_unlock This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-03 18:16:26.987000
Last modified
2026-10-19 20:18:39.850000
View original CVE JSON
{
"id": "CVE-2026-46259",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-03T18:16:26.987",
"lastModified": "2026-10-19T20:18:39.850",
"vulnStatus": "Modified",
"cveTags": [],
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent\nwithout proper RCU protection, which leads to:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- Too late to protect task->real_parent!\n task_pid_ptr <--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: corrige la falta de protección RCU al leer real_parent en do_task_stat()\n\nAl leer /proc/[pid]/stat, do_task_stat() accede a task->real_parent sin la protección RCU adecuada, lo que lleva a:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- ¡Demasiado tarde para proteger task->real_parent!\n task_pid_ptr <--- ¡UAF!\n rcu_read_unlock\n\nEste parche utiliza task_ppid_nr_ns() en lugar de task_tgid_nr_ns() para añadir la protección RCU adecuada para acceder a task->real_parent."
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