CVE-2026-43045 (GCVE-0-2026-43045)
Vulnerability from cvelistv5
Published
2026-05-01 14:15
Modified
2026-05-11 22:16
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 621191d709b14882270dfd8ea5d7d6cdfebe2c35
Version: 621191d709b14882270dfd8ea5d7d6cdfebe2c35
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hv/mshv_regions.c"
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              "version": "0",
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              "status": "unaffected",
              "version": "7.0",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmshv: Fix error handling in mshv_region_pin\n\nThe current error handling has two issues:\n\nFirst, pin_user_pages_fast() can return a short pin count (less than\nrequested but greater than zero) when it cannot pin all requested pages.\nThis is treated as success, leading to partially pinned regions being\nused, which causes memory corruption.\n\nSecond, when an error occurs mid-loop, already pinned pages from the\ncurrent batch are not properly accounted for before calling\nmshv_region_invalidate_pages(), causing a page reference leak.\n\nTreat short pins as errors and fix partial batch accounting before\ncleanup."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:16:39.059Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a7d149152bc5a9119854331c57be35ad31fdf5cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0e296f257671ba10249630fe58026f29e4804d9"
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      "title": "mshv: Fix error handling in mshv_region_pin",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43045",
    "datePublished": "2026-05-01T14:15:40.976Z",
    "dateReserved": "2026-05-01T14:12:55.979Z",
    "dateUpdated": "2026-05-11T22:16:39.059Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
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