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GHSA-WPC6-X34R-QGJ2

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74379"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:39Z",
    "severity": null
  },
  "details": "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\u0027ed 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.",
  "id": "GHSA-wpc6-x34r-qgj2",
  "modified": "2026-08-15T06:32:31Z",
  "published": "2026-08-15T06:32:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74379"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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