sound/core/timer.c in the Linux kernel before 4.4.1 employs a locking approach that does not consider slave timer instances, which allows local users to cause a denial of service (race condition, use-after-free, and system crash) via a crafted ioctl call.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-2547 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2, as the flaw was already fixed in the products listed.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 5.4 |
|---|---|
| Base Metrics | AV:L/AC:M/Au:N/C:N/I:P/A:C |
| Access Vector | Local |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected |
| Red Hat Enterprise Linux 7 | kernel | Not affected |
| Red Hat Enterprise Linux 6 | kernel | Will not fix |
| Red Hat Enterprise Linux 5 | kernel | Will not fix |
Vulmon