mshv: Fix error handling in mshv_region_pin
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.
CVE-2026-43045
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43045
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
"lessThan": "d14847cb7f65d419e43451d416a1f50c09a5f3be",
"versionType": "git"
},
{
"status": "affected",
"version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
"lessThan": "a7d149152bc5a9119854331c57be35ad31fdf5cc",
"versionType": "git"
},
{
"status": "affected",
"version": "621191d709b14882270dfd8ea5d7d6cdfebe2c35",
"lessThan": "c0e296f257671ba10249630fe58026f29e4804d9",
"versionType": "git"
}
],
"programFiles": [
"drivers/hv/mshv_regions.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hv/mshv_regions.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43045
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28601 · Revision 1
- Added to Heist Feed
- Publisher date