CVE-2026-46259

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-46259

Key Details

CVE	CVE-2026-46259
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46259
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46259

Source

Reference

NVD

CVE