CVE-2016-9604

kernel: security: The built-in keyrings for security tokens can be joined as a session and then modified by the root user

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Severity

Low

Red Hat Product Security

4.4

CVSS 3.0

Review impact separately from score.

Published · April 18, 2017

Updated · June 30, 2026

Description

It was discovered 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.

Statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code with the flaw is not present in this product.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 4.4
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

CVSS 2.0 · 1.2
AV:L/AC:H/Au:N/C:N/I:P/A:N

CWE-732 · Incorrect Permission Assignment for Critical Resource