CVE-2026-46259High· 7.8▾ TwilightIn 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 R…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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.
Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < fefa0fcd78be465b7ad4c497fa6ec90d64194c04Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < c93a33f28f915d446eea6fb3f0e1def0b3af1982Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < 1c8dc5b5517546c68ffae40b948336122bb61306Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < 0e64bd46a04a4fd61279aca9f53a664e9e5f7e7eLinux >= 06fffb1267c9d986687b69d74a46ee332a50575e < 73ec7c96601d61d52310c659145bb06d933a0fa6Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < 4f9ae386861e280b7631ca252f798d25575627eeLinux >= 06fffb1267c9d986687b69d74a46ee332a50575e < dd8b13cb4ff1a4545a214ed897fdf2bc341155b6Linux >= 06fffb1267c9d986687b69d74a46ee332a50575e < 76149d53502cf17ef3ae454ff384551236fba867Linux 2.6.26Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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