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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
06fffb1267c9d986687b69d74a46ee332a50575e to < fefa0fcd78be465b7ad4c497fa6ec90d64194c04affected06fffb1267c9d986687b69d74a46ee332a50575e to < c93a33f28f915d446eea6fb3f0e1def0b3af1982affected06fffb1267c9d986687b69d74a46ee332a50575e to < 1c8dc5b5517546c68ffae40b948336122bb61306affected06fffb1267c9d986687b69d74a46ee332a50575e to < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7eaffected06fffb1267c9d986687b69d74a46ee332a50575e to < 73ec7c96601d61d52310c659145bb06d933a0fa6affected06fffb1267c9d986687b69d74a46ee332a50575e to < 4f9ae386861e280b7631ca252f798d25575627eeaffected06fffb1267c9d986687b69d74a46ee332a50575e to < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6affected06fffb1267c9d986687b69d74a46ee332a50575e to < 76149d53502cf17ef3ae454ff384551236fba867affected
Linux Linux
Default version status: affected
2.6.26affected0 to < 2.6.26unaffected5.10.252 to ≤ 5.10.*unaffected5.15.202 to ≤ 5.15.*unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04 ↗
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982 ↗
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306 ↗
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e ↗
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6 ↗
- https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee ↗
- https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6 ↗
- https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867 ↗