CVE-2026-89998 (GCVE-0-2026-89998)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix race when loading and unloading a table If the userspace calls two concurrent table load ioctls and one of them succeeds and the other fails, there is a race condition because dm_setup_md_queue walks &md->table_devices without any lock. If the walk races with dm_table_destroy -> free_devices -> dm_put_table_device, there is access to invalid memory. Fix this race by extending the lock over the list walk.
References
Impacted products
Vendor Product Version
Linux Linux Version: 773bfda35c9511734d7f898e2ee73cd60d2a3f38
Version: 1a581b72169968f4154b5793828f3bc28b258b35
Version: 1a581b72169968f4154b5793828f3bc28b258b35
Version: 1a581b72169968f4154b5793828f3bc28b258b35
Version: 1a581b72169968f4154b5793828f3bc28b258b35
Version: 1a581b72169968f4154b5793828f3bc28b258b35
Version: 600593707c239bb99486925d65540a5020bc1e58
Version: 6.1.2   ≤
Version: 6.0.16   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          ]
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "6.1.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
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                {
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                {
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                  "versionEndExcluding": "7.3",
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                {
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                  "versionStartIncluding": "6.0.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix race when loading and unloading a table\n\nIf the userspace calls two concurrent table load ioctls and one of them\nsucceeds and the other fails, there is a race condition because\ndm_setup_md_queue walks \u0026md-\u003etable_devices without any lock. If the walk\nraces with dm_table_destroy -\u003e free_devices -\u003e dm_put_table_device, there\nis access to invalid memory.\n\nFix this race by extending the lock over the list walk."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The race is reached only through local DM_TABLE_LOAD ioctls on /dev/mapper/control (ctl_ioctl \u2192 table_load \u2192 dm_setup_md_queue walking md-\u003etable_devices). No network, Bluetooth, or physical-bus path loads a device-mapper table.\nAC:L - The attacker issues two concurrent table-load ioctls on a mapped device they created, owning both sides of the race: one load fails after populate_table added devices and dm_table_destroy frees them while the other walks the list. Device-mapper is a standard distro component, not a rare config.\nPR:L - ctl_ioctl requires capable(CAP_SYS_ADMIN). In the most severe reasonable deployment that capability is held by a container, CSI, or LVM/storage-stack administrator with delegated /dev/mapper/control rather than exclusive host root, matching kernel-CNA scoring of other device-mapper ioctl bugs as Low.\nUI:N - The attacker performs every step with its own ioctls (DM_DEV_CREATE then concurrent DM_TABLE_LOAD). No separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The use-after-free of struct table_device stays inside the host kernel\u0027s security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - dm_setup_md_queue walks md-\u003etable_devices and dereferences td-\u003edm_dev.bdev after a concurrent dm_table_destroy has kfree\u0027d the table_device. Reclaiming that slab object yields an arbitrary kernel read, so confidentiality is High.\nI:H - The same use-after-free lets an attacker spray a replacement object so bd_link_disk_holder writes through an attacker-controlled bdev pointer, a classic heap UAF write and control-flow hijack primitive, so integrity is High.\nA:H - Walking a freed table_device list entry or calling bd_link_disk_holder on a dangling bdev causes a kernel oops, panic, or hang, which is a complete availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:56:12.250Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b02e35b81176c7d61dd441cc7a2e5c324a82444b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1af1884c960b98c621b6fe2fea1216b78c02152"
        },
        {
          "url": "https://git.kernel.org/stable/c/af1f32ccf8051f4691ced11feb452b9d13561727"
        },
        {
          "url": "https://git.kernel.org/stable/c/00ad6f9ed27f91925d4d3fb7aab50a60d774f998"
        },
        {
          "url": "https://git.kernel.org/stable/c/5380c7f6335cc6d77eb77d065105e81155c4d9d3"
        }
      ],
      "title": "dm: fix race when loading and unloading a table",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89998",
    "datePublished": "2026-09-16T10:33:10.012Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-10-19T08:56:12.250Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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