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GHSA-4CJ3-MPCR-RFQF

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

dm: fix reading free memory in do_resume

When do_resume calls dm_table_get_mode(new_map), the call is done without holding any locks (it only holds a reference to the md). It may be possible that another concurrent ioctl on the same device will swap table after dm_swap_table and before dm_table_get_mode. In this case, dm_table_get_mode(new_map) reads freed memory.

This race condition was triggered by syzbot.

This commit fixes the race by reading mode of the new table before dm_swap_table. Note that new_map is also passed to dm_ima_need_measure, but this function doesn't attempt to dereference it, so this call should be safe.

Note that this is not a security bug because only root can trigger it and the commonly used tools such as lvm or cryptsetup do not call the ioctls concurrently, so that they can't trigger it acceidentally.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99036"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:26Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix reading free memory in do_resume\n\nWhen do_resume calls dm_table_get_mode(new_map), the call is done without\nholding any locks (it only holds a reference to the md). It may be\npossible that another concurrent ioctl on the same device will swap table\nafter dm_swap_table and before dm_table_get_mode. In this case,\ndm_table_get_mode(new_map) reads freed memory.\n\nThis race condition was triggered by syzbot.\n\nThis commit fixes the race by reading mode of the new table before\ndm_swap_table. Note that new_map is also passed to dm_ima_need_measure,\nbut this function doesn\u0027t attempt to dereference it, so this call should\nbe safe.\n\nNote that this is not a security bug because only root can trigger it and\nthe commonly used tools such as lvm or cryptsetup do not call the ioctls\nconcurrently, so that they can\u0027t trigger it acceidentally.",
  "id": "GHSA-4cj3-mpcr-rfqf",
  "modified": "2026-10-23T15:31:36Z",
  "published": "2026-10-23T15:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99036"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99036 (GCVE-0-2026-99036)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-23 12:21

Title

dm: fix reading free memory in do_resume

Summary

In the Linux kernel, the following vulnerability has been resolved: dm: fix reading free memory in do_resume When do_resume calls dm_table_get_mode(new_map), the call is done without holding any locks (it only holds a reference to the md). It may be possible that another concurrent ioctl on the same device will swap table after dm_swap_table and before dm_table_get_mode. In this case, dm_table_get_mode(new_map) reads freed memory. This race condition was triggered by syzbot. This commit fixes the race by reading mode of the new table before dm_swap_table. Note that new_map is also passed to dm_ima_need_measure, but this function doesn't attempt to dereference it, so this call should be safe. Note that this is not a security bug because only root can trigger it and the commonly used tools such as lvm or cryptsetup do not call the ioctls concurrently, so that they can't trigger it acceidentally.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/281f68d6cf8acb254…
https://git.kernel.org/stable/c/2c96d1a8324e7736e…
https://git.kernel.org/stable/c/e3bf232c913b7e010…
https://git.kernel.org/stable/c/301691c32b8ad023e…
https://git.kernel.org/stable/c/c9417c1c5269e2bd0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e3bf232c913b7e0103d323f15e6342d37cb1b357 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 301691c32b8ad023e3316d5dbb6a8cf52d47b0dc (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c9417c1c5269e2bd0570fbe53e4ec03a8d31f008 (git) Affected: 0 , < 6.6.160 (semver) Affected: 0 , < 6.12.113 (semver) Affected: 0 , < 6.18.57 (semver) Affected: 0 , < 7.2.11 (semver)
Linux	Linux	Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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        {
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          "programFiles": [
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              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
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              "status": "unaffected",
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            },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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