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CVE-2026-46259

7.8 · HIGH

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() acc…

Published Jun 3, 2026EPSS 0.18%

Overview

CVE-2026-46259 is a high-severity vulnerability. It was published on June 3, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7eRefgit.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306Refgit.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627eeRefgit.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6Refgit.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867Refgit.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982Refgit.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6Refgit.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46259?

CVE-2026-46259 is a high-severity vulnerability. It was published on June 3, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46259?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-46259?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-46259?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46259 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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