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CVE-2026-46259 is a use-after-free vulnerability in the Linux kernel procfs implementation. While reading process statistics, do_task_stat() accesses task->real_parent before establishing RCU protection. Concurrent task release can free the referenced parent task structure before task_tgid_nr_ns() accesses it through task_pid_ptr(). The RCU read lock acquired inside task_tgid_nr_ns() is too late to protect the original reference. The fix uses task_ppid_nr_ns() to protect the parent-task access correctly.
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A Linux kernel procfs use-after-free vulnerability caused by missing RCU protection when do_task_stat() accesses task->real_parent. The fix uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to ensure proper protection. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impacts.
A vulnerability addressed in Huawei EulerOS UVP 2.10.1 kernel-related packages.
A Linux kernel procfs vulnerability caused by missing RCU protection when reading real_parent in do_task_stat().
A Linux kernel procfs vulnerability caused by missing RCU protection when reading real_parent in do_task_stat().
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Cross-references every affected SKU, including bundled OEM variants.
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