High 7.8Published Jun 3, 2026

CVE-2026-46259procfs: fix missing RCU protection when reading real_parent in do_task_stat()

Updated under an hour ago (Oct 26, 2026, 3:50 PM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 06fffb1267c9d986687b69d74a46ee332a50575e before fefa0fcd78be465b7ad4c497fa6ec90d64194c04; from 06fffb1267c9d986687b69d74a46ee332a50575e before c93a33f28f915d446eea6fb3f0e1def0b3af1982; 06fffb1267c9d986687b69d74a46ee332a50575e builds before 1c8dc5b5517546c68ffae40b948336122bb61306; 06fffb1267c9d986687b69d74a46ee332a50575e builds before 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e; from 06fffb1267c9d986687b69d74a46ee332a50575e before 73ec7c96601d61d52310c659145bb06d933a0fa6; 06fffb1267c9d986687b69d74a46ee332a50575e builds before 4f9ae386861e280b7631ca252f798d25575627ee; from 06fffb1267c9d986687b69d74a46ee332a50575e before dd8b13cb4ff1a4545a214ed897fdf2bc341155b6; from 06fffb1267c9d986687b69d74a46ee332a50575e before 76149d53502cf17ef3ae454ff384551236fba867	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.26 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4	NVD

References

References

https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04	patch
https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982	patch
https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306	patch
https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e	patch
https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6	patch
https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee	patch
https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6	patch
https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.