Description
The Linux kernel, as used in Ubuntu 18.10 and when booted with UEFI Secure Boot enabled, allows privileged local users to bypass intended Secure Boot restrictions and execute untrusted code by loading arbitrary kernel modules. This occurs because a modified kernel/module.c, in conjunction with certain configuration options, leads to mishandling of the result of signature verification.
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 | 5.4.6-1 | — |
| Debian 13 | linux | 5.4.6-1 | — |
| Debian 12 | linux | 5.4.6-1 | — |
References
- https://launchpad.net/bugs/1798863
- USN-3835-1 vendor-advisory
- USN-3832-1 vendor-advisory