kernel: securelevel disabled after kexec
Published Sep 19, 2017
5.5
MEDIUMCVSS 3.0
EPSS 0.40%
Description
The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.
Affected products
No data.
- 7.0
- 7.2
- 7.3
- 7.0
- 7.3
- 7.4
- 7.0
- 2.0
- 7.0
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-327.el7
Fixed · RHSA-2015:2152
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-327.rt56.204.el7
Fixed · RHSA-2015:2411
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise MRG 2
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-327.el7 | Fixed | RHSA-2015:2152 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-327.rt56.204.el7 | Fixed | RHSA-2015:2411 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5 and 6. This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7, kernel-rt and MRG-2.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
AV:L/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.40% (0.00405) | 32.37th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.40% (0.00405) | 31.98th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00073) | 19.62th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.03% (0.01034) | 39.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
References (9)
- http://rhn.redhat.com/errata/RHSA-2015-2152.html vendor-advisoryx_refsource_REDHATVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2015-2411.html vendor-advisoryx_refsource_REDHATVendor Advisory
- http://www.openwall.com/lists/oss-security/2015/10/15/6 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/77097 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-7837 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1272472 x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://github.com/mjg59/linux/commit/4b2b64d5a6ebc84214755ebccd599baef7c1b798 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-7837
- https://www.cve.org/CVERecord?id=CVE-2015-7837
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2015-2152.html | vendor-advisoryx_refsource_REDHATVendor Advisory | |
| http://rhn.redhat.com/errata/RHSA-2015-2411.html | vendor-advisoryx_refsource_REDHATVendor Advisory | |
| http://www.openwall.com/lists/oss-security/2015/10/15/6 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/77097 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2015-7837 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1272472 | x_refsource_CONFIRMIssue TrackingVendor Advisory | |
| https://github.com/mjg59/linux/commit/4b2b64d5a6ebc84214755ebccd599baef7c1b798 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-7837 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-7837 |
Change history (0)
No recorded changes yet.