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Vulnerability record · CVE-2026-46259 · published 3 June 2026

CVE-2026-46259: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6%
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
22 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e Patch
https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 Patch
https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee Patch
https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 Patch
https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 Patch
https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 Patch
https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 Patch
https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46259), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.