sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[] (CVE-2026-80929) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80929

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

Answer in brief

CVE-2026-80929 records a Unknown severity vulnerability in sysctl: move the "cad_pid" entry from pid_table[] to kern_reboot_table[]. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 12, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=e054bcbe7e7af2baad3752f1a4916a7fffc0457e <e8527de7fea191fda704792a56081f9009aeec37 \|\| >=e054bcbe7e7af2baad3752f1a4916a7fffc0457e <a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd \|\| >=e054bcbe7e7af2baad3752f1a4916a7fffc0457e <7170ca01623b399c97f2ae9d3e228badc1f25ea3	e8527de7fea191fda704792a56081f9009aeec37, a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd, 7170ca01623b399c97f2ae9d3e228badc1f25ea3
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to e8527de7fea191fda704792a56081f9009aeec37 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.