CVE-2026-43109: x86: shadow stacks: proper error handling for mmap lock
In the Linux kernel, the following vulnerability has been resolved:
x86: shadow stacks: proper error handling for mmap lock
김영민 reports that shstkpopsigframe() doesn't check for errors from mmapreadlockkillable(), which is a silly oversight, and also shows that we haven't marked those functions with "mustcheck", which would have immediately caught it.
So let's fix both issues.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43109?
The severity of CVE-2026-43109 has not been explicitly classified, but it involves error handling issues in the Linux kernel which could potentially impact stability.
How do I fix CVE-2026-43109?
To fix CVE-2026-43109, it is recommended to update your Linux kernel to the latest stable version where this vulnerability has been resolved.
What are the potential impacts of CVE-2026-43109?
CVE-2026-43109 could lead to unexpected behavior in the kernel due to improper error handling, possibly affecting application stability.
Which versions of the Linux kernel are affected by CVE-2026-43109?
CVE-2026-43109 affects specific versions of the Linux kernel that implement shadow stacks and the associated mmap handling.
Who reported CVE-2026-43109?
CVE-2026-43109 was reported by a researcher named 김영민.