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GHSA-QXQQ-X3CW-322M

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31

Details

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.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89998"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:11Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-qxqq-x3cw-322m",
  "modified": "2026-09-16T15:31:04Z",
  "published": "2026-09-16T12:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89998"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00ad6f9ed27f91925d4d3fb7aab50a60d774f998"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5380c7f6335cc6d77eb77d065105e81155c4d9d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1af1884c960b98c621b6fe2fea1216b78c02152"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af1f32ccf8051f4691ced11feb452b9d13561727"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b02e35b81176c7d61dd441cc7a2e5c324a82444b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-89998 (GCVE-0-2026-89998)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-17 09:29

Title

dm: fix race when loading and unloading a table

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/b02e35b81176c7d61…
https://git.kernel.org/stable/c/0ea6e5ad4a5817e91…
https://git.kernel.org/stable/c/a1af1884c960b98c6…
https://git.kernel.org/stable/c/af1f32ccf8051f469…
https://git.kernel.org/stable/c/00ad6f9ed27f91925…
https://git.kernel.org/stable/c/5380c7f6335cc6d77…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 773bfda35c9511734d7f898e2ee73cd60d2a3f38 , < b02e35b81176c7d61dd441cc7a2e5c324a82444b (git) Affected: 1a581b72169968f4154b5793828f3bc28b258b35 , < 0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca (git) Affected: 1a581b72169968f4154b5793828f3bc28b258b35 , < a1af1884c960b98c621b6fe2fea1216b78c02152 (git) Affected: 1a581b72169968f4154b5793828f3bc28b258b35 , < af1f32ccf8051f4691ced11feb452b9d13561727 (git) Affected: 1a581b72169968f4154b5793828f3bc28b258b35 , < 00ad6f9ed27f91925d4d3fb7aab50a60d774f998 (git) Affected: 1a581b72169968f4154b5793828f3bc28b258b35 , < 5380c7f6335cc6d77eb77d065105e81155c4d9d3 (git) Affected: 600593707c239bb99486925d65540a5020bc1e58 (git) Affected: 6.1.2 , < 6.1.188 (semver) Affected: 6.0.16 , < 6.1 (semver)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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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",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.1.188",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
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                {
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      ],
      "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": [
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            "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"
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          "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."
            }
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          "url": "https://git.kernel.org/stable/c/00ad6f9ed27f91925d4d3fb7aab50a60d774f998"
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          "url": "https://git.kernel.org/stable/c/5380c7f6335cc6d77eb77d065105e81155c4d9d3"
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      ],
      "title": "dm: fix race when loading and unloading a table",
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        "engine": "bippy-1.2.0"
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    "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": "2026-09-17T09:29:23.946Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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