CVE-2026-46259
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
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.
INFO
Published Date :
June 3, 2026, 6:16 p.m.
Last Modified :
June 9, 2026, 8:09 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the provided Linux kernel patch.
- Update your Linux kernel to the patched version.
- Reboot the system if kernel update requires it.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46259.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46259 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46259
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46259 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46259 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.128 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.75 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.202 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.165 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.26 up to (excluding) 5.10.252 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 05, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 03, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e Added Reference https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 Added Reference https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee Added Reference https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 Added Reference https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 Added Reference https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 Added Reference https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 Added Reference https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04