CVE-2026-99086 (GCVE-0-2026-99086)
Vulnerability from cvelistv5
Published
2026-10-23 12:45
Modified
2026-10-23 12:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: validate the superblock on resume dm_integrity_resume() re-reads the superblock from the device so that it picks up the flags and the recalculate position. It performs no validation on the result, while the constructor validates the superblock it reads and sizes all the in-memory structures according to it. The user may modify the superblock on the underlying device while the dm-integrity device is suspended, so that the two no longer agree. In particular, access_journal_data() shifts the journal entry index by ic->sb->log2_sectors_per_block, while ic->journal_section_sectors and the journal page list were computed with the value that was present at constructor time. Increasing log2_sectors_per_block makes the index run past the end of the journal, and dm-integrity then writes 512 bytes through lowmem_page_address(NULL). Snapshot the validated superblock in the constructor and refuse to resume if any of the fields that describe the on-disk geometry changed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 38625191f32f77a9d5fc7cc15f4f9b78768bfb33
Version: 118ba36e446c01e3cd34b3eedabf1d9436525e1d
Version: 118ba36e446c01e3cd34b3eedabf1d9436525e1d
Version: 824b9c27d7b600520b95f0cab95a47d1b08a9483
Version: fb49f209995f729053c6ee728436f98d78a49b6f
Version: c6138af1f5454c2631a837916fda958ea72c0d71
Version: 3ff70e2e31c419e2230d0c66cb2bfb3b1b414b7f
Version: 6.18.16   ≤
Version: 6.1.165   ≤
Version: 6.6.128   ≤
Version: 6.12.75   ≤
Version: 6.19.6   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: validate the superblock on resume\n\ndm_integrity_resume() re-reads the superblock from the device so that it\npicks up the flags and the recalculate position. It performs no\nvalidation on the result, while the constructor validates the superblock\nit reads and sizes all the in-memory structures according to it. The user\nmay modify the superblock on the underlying device while the dm-integrity\ndevice is suspended, so that the two no longer agree.\n\nIn particular, access_journal_data() shifts the journal entry index by\nic-\u003esb-\u003elog2_sectors_per_block, while ic-\u003ejournal_section_sectors and the\njournal page list were computed with the value that was present at\nconstructor time. Increasing log2_sectors_per_block makes the index run\npast the end of the journal, and dm-integrity then writes 512 bytes\nthrough lowmem_page_address(NULL).\n\nSnapshot the validated superblock in the constructor and refuse to resume\nif any of the fields that describe the on-disk geometry changed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:45:04.496Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/fc79aeb86a2c244c1f1894e2d8f2966fe2b60fa2"
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      ],
      "title": "dm-integrity: validate the superblock on resume",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99086",
    "datePublished": "2026-10-23T12:45:04.496Z",
    "dateReserved": "2026-09-25T10:25:14.390Z",
    "dateUpdated": "2026-10-23T12:45:04.496Z",
    "state": "PUBLISHED"
  },
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}


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