The restore_fpu_checking function in arch/x86/include/asm/fpu-internal.h in the Linux kernel before 3.12.8 on the AMD K7 and K8 platforms does not clear pending exceptions before proceeding to an EMMS instruction, which allows local users to cause a denial of service (task kill) or possibly gain privileges via a crafted application.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2014-1438 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6.
| Base Score | 4.7 |
|---|---|
| Base Metrics | AV:L/AC:M/Au:N/C:N/I:N/A:C |
| Access Vector | Local |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) | RHSA-2014:0439 | 2014-04-28 |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | kernel | Not affected |
| Red Hat Enterprise Linux 6 | kernel | Not affected |
| Red Hat Enterprise Linux 5 | kernel | Not affected |
Vulmon