CVE-2026-46259

Advisory lineage Upstream: 0 Downstream: 17
Analyzed
Published: 03 Jun 2026, 15:49
Last modified:05 Jun 2026, 06:06

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.12% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

03 Jun 2026, 15:49
Published
Vulnerability first disclosed
05 Jun 2026, 06:06
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.12%• Percentile: 2%

Affected Systems

  • linux•linux

    ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < fefa0fcd78be465b7ad4c497fa6ec90d64194c04 | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < c93a33f28f915d446eea6fb3f0e1def0b3af1982 | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < 1c8dc5b5517546c68ffae40b948336122bb61306 | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < 73ec7c96601d61d52310c659145bb06d933a0fa6 | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < 4f9ae386861e280b7631ca252f798d25575627ee | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 | ≥ 06fffb1267c9d986687b69d74a46ee332a50575e, < 76149d53502cf17ef3ae454ff384551236fba867 | 2.6.26

  • linux•linux kernel

    ≥ 2.6.26, < 5.10.252 | ≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.14 | ≥ 6.19, < 6.19.4

References (8)