In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat()… (CVE-2026-46259)
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.
AI Analysis
Technical Summary
The Linux kernel vulnerability involves missing Read-Copy-Update (RCU) protection when accessing the real_parent pointer in the do_task_stat() function, which is used when reading /proc/[pid]/stat. The original code accessed task->real_parent without holding the RCU read lock, leading to a use-after-free (UAF) condition. The patch corrects this by using task_ppid_nr_ns(), which properly applies RCU protection during access. This vulnerability affects multiple Ubuntu kernel versions prior to 5.15.0-1112.119~20.04.1 and similar versions listed. No known exploits in the wild have been reported.
Potential Impact
The vulnerability can cause a use-after-free condition when reading process statistics via /proc/[pid]/stat, potentially leading to kernel memory corruption or instability. The CVSS 4.0 vector indicates a local attacker with low privileges and high complexity is required, with partial user interaction and high impact on confidentiality, integrity, and availability. However, no known exploits have been observed in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later (and other specified patched versions). Users should update their Linux kernel to these or newer versions to remediate the vulnerability. Since this is not a cloud service, manual patching is required. No additional mitigation steps are indicated by the vendor advisory.
In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading real_parent in do_task_stat()… (CVE-2026-46259)
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.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability involves missing Read-Copy-Update (RCU) protection when accessing the real_parent pointer in the do_task_stat() function, which is used when reading /proc/[pid]/stat. The original code accessed task->real_parent without holding the RCU read lock, leading to a use-after-free (UAF) condition. The patch corrects this by using task_ppid_nr_ns(), which properly applies RCU protection during access. This vulnerability affects multiple Ubuntu kernel versions prior to 5.15.0-1112.119~20.04.1 and similar versions listed. No known exploits in the wild have been reported.
Potential Impact
The vulnerability can cause a use-after-free condition when reading process statistics via /proc/[pid]/stat, potentially leading to kernel memory corruption or instability. The CVSS 4.0 vector indicates a local attacker with low privileges and high complexity is required, with partial user interaction and high impact on confidentiality, integrity, and availability. However, no known exploits have been observed in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later (and other specified patched versions). Users should update their Linux kernel to these or newer versions to remediate the vulnerability. Since this is not a cloud service, manual patching is required. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46259
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a5b61012d1edb114c85a3b1
Added to database: 07/18/2026, 11:18:25 UTC
Last enriched: 07/30/2026, 13:53:03 UTC
Last updated: 07/31/2026, 19:30:20 UTC
Views: 3
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