CVE-2026-46259 (GCVE-0-2026-46259)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-05 06:06
VLAI
Title
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < fefa0fcd78be465b7ad4c497fa6ec90d64194c04 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < c93a33f28f915d446eea6fb3f0e1def0b3af1982 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 1c8dc5b5517546c68ffae40b948336122bb61306 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 73ec7c96601d61d52310c659145bb06d933a0fa6 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 4f9ae386861e280b7631ca252f798d25575627ee (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 (git)
Affected: 06fffb1267c9d986687b69d74a46ee332a50575e , < 76149d53502cf17ef3ae454ff384551236fba867 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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  }
}


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