Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/mseal: update VMA end correctly on merge Previously we stored the end of the current VMA in curr_end, and then upon iterating to the next VMA updated curr_start to curr_end to advance to the next VMA. However, this doesn't take into account the fact that a VMA might be updated due to a merge by vma_modify_flags(), which can result in curr_end being stale and thus, upon setting curr_start to curr_end, ending up with an incorrect curr_start on the next iteration. Resolve the issue by setting curr_end to vma->vm_end unconditionally to ensure this value remains updated should this occur. While we're here, eliminate this entire class of bug by simply setting const curr_[start/end] to be clamped to the input range and VMAs, which also happens to simplify the logic.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.17.1, < 6.18.21 |
References
- https://git.kernel.org/stable/c/2697dd8ae721db4f6a53d4f4cbd438212a80f8dcPatch
- https://git.kernel.org/stable/c/40b3f4700e5535fbe74738cebb9379a40ec66bedPatch
- https://git.kernel.org/stable/c/83737e34b83a23b2a9bcf586b058b2c2a54c7c6bPatch
FAQ
What is CVE-2026-23416?
CVE-2026-23416 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: mm/mseal: update VMA end correctly on merge Previously we stored the end of the current VMA in curr_end, and then upon iterating t...
How severe is CVE-2026-23416?
CVE-2026-23416 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23416?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.