7.8

CVE-2026-46259

procfs: fix missing RCU protection when reading real_parent in do_task_stat()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.26 < 5.10.252
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.202
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.165
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.128
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.75
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.14
Linux ≫ Linux Kernel Version >= 6.19 < 6.19.4
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.022
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
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