CVE-2026-93075 (GCVE-0-2026-93075)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-10-19 09:05
VLAI
Title
dax/fsdev: clear pgmap ops and owner on unbind
Summary
In the Linux kernel, the following vulnerability has been resolved: dax/fsdev: clear pgmap ops and owner on unbind fsdev_dax_probe() sets pgmap->ops = &fsdev_pagemap_ops and pgmap->owner = dev_dax, but nothing ever clears them. For a dynamic device the pgmap is devm-allocated and freed on unbind, so this is harmless. For a static device the pgmap is the shared, long-lived one owned by the dax bus (kill_dev_dax() only NULLs dev_dax->pgmap for the non-static case), and device.c's probe sets only pgmap->type, never clearing ops/owner. So after fsdev unbinds a static device the stale fsdev_pagemap_ops survives on the shared pgmap. If the device is then rebound to device_dax (MEMORY_DEVICE_GENERIC, which installs no ->memory_failure), or the fsdev_dax module is unloaded, a subsequent memory_failure on that pgmap dispatches through the stale -- and possibly freed -- handler. Register a devm action that clears pgmap->ops and pgmap->owner on unbind, symmetric with setting them at probe, so the pgmap carries no fsdev state once fsdev is detached.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d5406bd458b0ac10b1301a4d5801d85c8f648637 , < 9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27 (git)
Affected: d5406bd458b0ac10b1301a4d5801d85c8f648637 , < f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dax/fsdev.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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          "vendor": "Linux",
          "versions": [
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              "version": "7.1"
            },
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              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear pgmap ops and owner on unbind\n\nfsdev_dax_probe() sets pgmap-\u003eops = \u0026fsdev_pagemap_ops and\npgmap-\u003eowner = dev_dax, but nothing ever clears them. For a dynamic\ndevice the pgmap is devm-allocated and freed on unbind, so this is\nharmless. For a static device the pgmap is the shared, long-lived one\nowned by the dax bus (kill_dev_dax() only NULLs dev_dax-\u003epgmap for the\nnon-static case), and device.c\u0027s probe sets only pgmap-\u003etype, never\nclearing ops/owner.\n\nSo after fsdev unbinds a static device the stale fsdev_pagemap_ops\nsurvives on the shared pgmap. If the device is then rebound to\ndevice_dax (MEMORY_DEVICE_GENERIC, which installs no -\u003ememory_failure),\nor the fsdev_dax module is unloaded, a subsequent memory_failure on that\npgmap dispatches through the stale -- and possibly freed -- handler.\n\nRegister a devm action that clears pgmap-\u003eops and pgmap-\u003eowner on unbind,\nsymmetric with setting them at probe, so the pgmap carries no fsdev state\nonce fsdev is detached."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:05:11.005Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27"
        },
        {
          "url": "https://git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7"
        }
      ],
      "title": "dax/fsdev: clear pgmap ops and owner on unbind",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93075",
    "datePublished": "2026-09-17T16:10:57.699Z",
    "dateReserved": "2026-09-17T15:57:05.661Z",
    "dateUpdated": "2026-10-19T09:05:11.005Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-08",
      "epss": "0.00198",
      "percentile": "0.09579"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/dax/fsdev.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
                  },
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                    "versionType": "git"
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                "defaultStatus": "affected",
                "product": "Linux",
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                  "drivers/dax/fsdev.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.1"
                  },
                  {
                    "lessThan": "7.1",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
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                    "versionType": "semver"
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                  }
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            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear pgmap ops and owner on unbind\n\nfsdev_dax_probe() sets pgmap-\u003eops = \u0026fsdev_pagemap_ops and\npgmap-\u003eowner = dev_dax, but nothing ever clears them. For a dynamic\ndevice the pgmap is devm-allocated and freed on unbind, so this is\nharmless. For a static device the pgmap is the shared, long-lived one\nowned by the dax bus (kill_dev_dax() only NULLs dev_dax-\u003epgmap for the\nnon-static case), and device.c\u0027s probe sets only pgmap-\u003etype, never\nclearing ops/owner.\n\nSo after fsdev unbinds a static device the stale fsdev_pagemap_ops\nsurvives on the shared pgmap. If the device is then rebound to\ndevice_dax (MEMORY_DEVICE_GENERIC, which installs no -\u003ememory_failure),\nor the fsdev_dax module is unloaded, a subsequent memory_failure on that\npgmap dispatches through the stale -- and possibly freed -- handler.\n\nRegister a devm action that clears pgmap-\u003eops and pgmap-\u003eowner on unbind,\nsymmetric with setting them at probe, so the pgmap carries no fsdev state\nonce fsdev is detached."
          }
        ],
        "id": "CVE-2026-93075",
        "lastModified": "2026-10-19T10:16:57.470",
        "metrics": {},
        "published": "2026-09-17T17:18:01.440",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:53:35+00:00",
      "cve": "CVE-2026-93075",
      "id": "CVE-2026-93075",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dax/fsdev: clear pgmap ops and owner on unbind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93075.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:28:43Z",
      "cve": "CVE-2026-93075",
      "id": "CVE-2026-93075",
      "initial_release_date": "2026-09-18T00:12:39Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93075",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-93075.json",
      "version": "6"
    }
  }
}



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