CVE-2026-46259procfs: fix missing RCU protection when reading real_parent in do_task_stat()
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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)
- Not given
- 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
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04patch
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982patch
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306patch
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7epatch
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6patch
- https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627eepatch
- https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6patch
- https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867patch
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.