CVE-2026-46259
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6
References (8)
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