CVE-2026-43045mshv: Fix error handling in mshv_region_pin
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 621191d709b14882270dfd8ea5d7d6cdfebe2c35 before d14847cb7f65d419e43451d416a1f50c09a5f3be; from 621191d709b14882270dfd8ea5d7d6cdfebe2c35 before a7d149152bc5a9119854331c57be35ad31fdf5cc; from 621191d709b14882270dfd8ea5d7d6cdfebe2c35 before c0e296f257671ba10249630fe58026f29e4804d9 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.15 before 6.19.12; 7.0; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/d14847cb7f65d419e43451d416a1f50c09a5f3be
- https://git.kernel.org/stable/c/a7d149152bc5a9119854331c57be35ad31fdf5ccpatch
- https://git.kernel.org/stable/c/c0e296f257671ba10249630fe58026f29e4804d9patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.