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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.5.1-1 | — |
| Debian 13 | linux | 4.5.1-1 | — |
| Debian 12 | linux | 4.5.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 26.10 | linux +8 | No fix yet | — |
| Ubuntu 26.04 LTS | linux +14 | No fix yet | — |
| Ubuntu 25.10 | linux +8 | No fix yet | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux +53 | No fix yet | — |
| Ubuntu 22.04 LTS | linux +29 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +5 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +4 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-93.116 | USN-3405-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1032.41 | USN-3405-1 |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1028.28 | USN-3405-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1071.79 | USN-3405-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1073.78 | USN-3405-1 |
| Ubuntu 14.04 LTS | linux-lts-vivid | 3.19.0-74.82~14.04.1 | — |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-93.116~14.04.1 | USN-3405-2 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime +3 | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime +2 | No fix yet | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +21 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 +6 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +7 | 3.10.0-327.rt56.204.el7 | RHSA-2015:2411 |
| RHEL 7 | perf +18 | 3.10.0-327.el7 | RHSA-2015:2152 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.29.1.el6uek | 0.4.5-3.el6 | ELSA-2019-4316 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.29.1.el7uek | 0.4.5-3.el7 | ELSA-2019-4316 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.29.1.el7uek | ELSA-2019-4316 |
| Oracle Linux 7 | perf +11 | 3.10.0-327.el7 | ELSA-2015-2152 |
Advisories 6
- RHSA-2015:2411 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2015:2152 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3405-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3405-1 linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ELSA-2019-4316 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 4, 2019
- ELSA-2015-2152 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 24, 2015
References
- https://github.com/mjg59/linux/commit/4b2b64d5a6ebc84214755ebccd599baef7c1b798
- https://bugzilla.redhat.com/show_bug.cgi?id=1272472
- RHSA-2015:2152 vendor-advisory
- 77097 vdb-entry
- [oss-security] 20151015 Re: CVE Request - Linux kernel - securelevel/secureboot bypass. mailing-list
- RHSA-2015:2411 vendor-advisory