CVE-2026-74379

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dax/kmem: account for partial discontiguous resource upon removal When dev_dax_kmem_probe() partially succeeds (at least one range is mapped) but a subsequent range fails request_mem_region() or add_memory_driver_managed(), the probe silently continues, ultimately returning success, but with the corresponding range resource NULL'ed out. dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if the underlying resource exists. When remove_memory() is called later, it returns 0 because the memory was never added which causes dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can be removed and attempts cleanup on a NULL pointer. Fix this by skipping these ranges altogether, noting that these cases are considered success, such that the cleanup is still reached when all actually-added ranges are successfully removed.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-08-15 06:22:39.703000

Last modified

2026-11-06 17:19:47.203000

View original CVE JSON

{
  "id": "CVE-2026-74379",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-15T06:22:39.703",
  "lastModified": "2026-11-06T17:19:47.203",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/kmem: account for partial discontiguous resource upon removal\n\nWhen dev_dax_kmem_probe() partially succeeds (at least one range is\nmapped) but a subsequent range fails request_mem_region() or\nadd_memory_driver_managed(), the probe silently continues, ultimately\nreturning success, but with the corresponding range resource NULL'ed out.\n\ndev_dax_kmem_remove() iterates over all dax_device ranges regardless of if\nthe underlying resource exists.  When remove_memory() is called later, it\nreturns 0 because the memory was never added which causes\ndev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can\nbe removed and attempts cleanup on a NULL pointer.\n\nFix this by skipping these ranges altogether, noting that these cases are\nconsidered success, such that the cleanup is still reached when all\nactually-added ranges are successfully removed."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/dax/kmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "ef4fc53898bd6c4d0119cc6d419ebef7f2560f31",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "d47b0b8a69a13e06afafa54723f3e8c99b0c788f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "799e54c510a03a65a57627018a817838d72f35bd",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "598ed7393a639c7547b28ff3e14db9f1ac37c132",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "30ea97affbcce236c57287c82dc6ef7a29c63b76",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "60e93dc097f7f13a16a7e4b75b8803eb2adbb721",
              "lessThan": "8aa442cfce79e2d69e72fc8e0c0864ac2971149d",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/dax/kmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.212",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.178",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.145",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.97",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.40",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.5",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-06T16:56:42.795588Z",
          "id": "CVE-2026-74379",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132",
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    },
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      "url": "https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}