The evm_verify_hmac function in security/integrity/evm/evm_main.c in the Linux kernel before 4.5 does not properly copy data, which makes it easier for local users to forge MAC values via a timing side-channel attack.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2016-2085 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4,5 and 6.
This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7 and kernel-rt packages and does not plan to be addressed in a future update.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
Base Score | 4.7 |
---|---|
Base Metrics | AV:L/AC:M/Au:N/C:N/I:C/A:N |
Access Vector | Local |
Access Complexity | Medium |
Authentication | None |
Confidentiality Impact | None |
Integrity Impact | Complete |
Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Platform | Package | State |
---|---|---|
Red Hat Enterprise MRG 2 | realtime-kernel | Will not fix |
Red Hat Enterprise Linux 7 | kernel | Will not fix |
Red Hat Enterprise Linux 7 | kernel-rt | Will not fix |
Red Hat Enterprise Linux 6 | kernel | Not affected |
Red Hat Enterprise Linux 5 | kernel | Not affected |
Red Hat Enterprise Linux 4 | kernel | Not affected |