A flaw was found in the Linux kernel's keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation.
Find out more about CVE-2016-4470 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 6 and may be addressed in a future update.
This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 7 and Red Hat Enterprise MRG 2 as the due updates to fix
this issue have been shipped now.
| Base Score | 6.9 |
|---|---|
| Base Metrics | AV:L/AC:M/Au:N/C:C/I:C/A:C |
| Access Vector | Local |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | Complete |
| Integrity Impact | Complete |
| Availability Impact | Complete |
| CVSS3 Base Score | 7.8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux Advanced Update Support 6.5 (kernel) | RHSA-2016:2074 | 2016-10-18 |
| Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) | RHSA-2016:1532 | 2016-08-02 |
| Red Hat Enterprise Linux 7 (kernel) | RHSA-2016:1539 | 2016-08-02 |
| Red Hat Enterprise Linux Advanced Update Support 6.4 (kernel) | RHSA-2016:2133 | 2016-11-01 |
| Red Hat Enterprise Linux Extended Update Support 6.6 (kernel) | RHSA-2016:2128 | 2016-10-31 |
| Red Hat Enterprise Linux Extended Update Support 7.1 (kernel) | RHSA-2016:1657 | 2016-08-23 |
| Red Hat Enterprise Linux Extended Update Support 6.7 (kernel) | RHSA-2016:2076 | 2016-10-18 |
| Red Hat Enterprise Linux 6 (kernel) | RHSA-2016:2006 | 2016-10-04 |
| Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) | RHSA-2016:1541 | 2016-08-02 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected |
Vulmon