Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mshv: Fix error handling in mshv_region_pin The current error handling has two issues: First, pin_user_pages_fast() can return a short pin count (less than requested but greater than zero) when it cannot pin all requested pages. This is treated as success, leading to partially pinned regions being used, which causes memory corruption. Second, when an error occurs mid-loop, already pinned pages from the current batch are not properly accounted for before calling mshv_region_invalidate_pages(), causing a page reference leak. Treat short pins as errors and fix partial batch accounting before cleanup.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.15, < 6.19.12 |
References
- https://git.kernel.org/stable/c/a7d149152bc5a9119854331c57be35ad31fdf5ccPatch
- https://git.kernel.org/stable/c/c0e296f257671ba10249630fe58026f29e4804d9Patch
FAQ
What is CVE-2026-43045?
CVE-2026-43045 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: mshv: Fix error handling in mshv_region_pin The current error handling has two issues: First, pin_user_pages_fast() can return a ...
How severe is CVE-2026-43045?
CVE-2026-43045 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-2026-43045?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.