CVE-2016-9604

What it is

It was discovered in the Linux kernel before 4.11-rc8 that root can gain direct access to an internal keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its session keyring. This allows root to bypass module signature verification by adding a new public key of its own devising to the keyring.

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account. High risk of data tampering.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-07-11 13:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:56 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 4.4 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-07-11 13:29 UTC

Last modified

2026-06-17 00:56 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-732 · Incorrect permission assignment

Record status

Modified

Affected

• Linux Kernel ≤ 4.11
• Linux Kernel 4.11

Attack profile CVSS 3.0 · 4.4

Attack vector

Local

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2016-9604.md and follow it. Check whether this project is affected by CVE-2016-9604. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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