---
id: CVE-2026-80929
title: 'sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]

  cad_pid is global, and kill_cad_pid() is only used in the root namespace.

  However, due to pid…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-279
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e <
    e8527de7fea191fda704792a56081f9009aeec37
  - >-
    Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e <
    a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd
  - >-
    Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e <
    7170ca01623b399c97f2ae9d3e228badc1f25ea3
  - Linux 6.17
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:45:13.127Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80929'
references:
  - url: 'https://git.kernel.org/stable/c/e8527de7fea191fda704792a56081f9009aeec37'
  - url: 'https://git.kernel.org/stable/c/a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd'
  - url: 'https://git.kernel.org/stable/c/7170ca01623b399c97f2ae9d3e228badc1f25ea3'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80929.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80929'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532283'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80929'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80929'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80929.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00162
epssPercentile: 0.05295
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]

cad_pid is global, and kill_cad_pid() is only used in the root namespace.

However, due to pid_table_root_permissions(), a non-root user can unshare
pid/user namespaces and modify it from the child namespace. This makes no
sense and is simply wrong.

Move it to kern_reboot_table[] where it logically belongs; this ensures
that only GLOBAL_ROOT_UID can read/modify this sysctl.

Note that this patch doesn't preserve "#ifdef CONFIG_PROC_SYSCTL" around
the "cad_pid"; CONFIG_PROC_SYSCTL selects CONFIG_SYSCTL, so it is always
set when kern_reboot_table[] is compiled.

## Affected

- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < e8527de7fea191fda704792a56081f9009aeec37`
- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd`
- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < 7170ca01623b399c97f2ae9d3e228badc1f25ea3`
- `Linux 6.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80929.json)