CVE-2026-46259
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_ta...
Published: 2026-06-03 · Last updated: 2026-06-09
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-46259
- [Patch]https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e
- [Patch]https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306
- [Patch]https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee
- [Patch]https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6
- [Patch]https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867
- [Patch]https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982
- [Patch]https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6
- [Patch]https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04
Related CVEs
Same vendor
- CVE-2026-46273 — In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapt... (8.6 HIGH)
- CVE-2026-46272 — In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etr: Fix race condition between sysfs and perf mode ... (4.7 MEDIUM)
- CVE-2026-46271 — In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: do WoW offloads only on primary link In case of multi... (7.8 HIGH)
- CVE-2026-46270 — In the Linux kernel, the following vulnerability has been resolved: power: supply: rt9455: Fix use-after-free in power_supply_changed() ... (8.4 HIGH)
- CVE-2026-46269 — In the Linux kernel, the following vulnerability has been resolved: pinctrl: canaan: k230: Fix NULL pointer dereference when parsing dev... (5.5 MEDIUM)