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

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-30 12:41
VLAI
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 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 2bc5df0cf906f36a8f59ac864139ee2b7b53d3c0 (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 48169328021dfd59121f9a66cca919b7defcd3fa (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 7a272c2338f758e3b6e664ebf7488ac40f48a2a4 (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82 (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < e3bf232c913b7e0103d323f15e6342d37cb1b357 (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < 301691c32b8ad023e3316d5dbb6a8cf52d47b0dc (git)
Affected: d58168763f74d1edbc296d7038c60efe6493fdd4 , < c9417c1c5269e2bd0570fbe53e4ec03a8d31f008 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
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)
guessed Create a notification for this product.
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          "value": "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."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-10-23T12:21:49.410Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
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          }
        ],
        "id": "CVE-2026-99036",
        "lastModified": "2026-10-30T13:21:40.677",
        "metrics": {},
        "published": "2026-10-23T13:17:26.820",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: dm: fix reading free memory in do_resume",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99036.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-10-28T00:47:38Z",
      "cve": "CVE-2026-99036",
      "id": "CVE-2026-99036",
      "initial_release_date": "2026-10-28T00:47:38Z",
      "product_status:known_affected": "158",
      "product_status:known_not_affected": "190",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99036",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99036.json",
      "version": "2"
    }
  }
}



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  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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