GHSA-W3X6-6F6F-54F3

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

s390/cio: Fix device lifecycle handling in css_alloc_subchannel()

css_alloc_subchannel() calls device_initialize() before setting up the DMA masks. If dma_set_coherent_mask() or dma_set_mask() fails, the error path frees the subchannel structure directly, bypassing the device model reference counting.

Once device_initialize() has been called, the embedded struct device must be released via put_device(), allowing the release callback to free the container structure.

Fix the error path by dropping the initial device reference with put_device() instead of calling kfree() directly.

This ensures correct device lifetime handling and avoids potential use-after-free or double-free issues.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45981"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:15Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cio: Fix device lifecycle handling in css_alloc_subchannel()\n\n`css_alloc_subchannel()` calls `device_initialize()` before setting up\nthe DMA masks. If `dma_set_coherent_mask()` or `dma_set_mask()` fails,\nthe error path frees the subchannel structure directly, bypassing\nthe device model reference counting.\n\nOnce `device_initialize()` has been called, the embedded struct device\nmust be released via `put_device()`, allowing the release callback to\nfree the container structure.\n\nFix the error path by dropping the initial device reference with\n`put_device()` instead of calling `kfree()` directly.\n\nThis ensures correct device lifetime handling and avoids potential\nuse-after-free or double-free issues.",
  "id": "GHSA-w3x6-6f6f-54f3",
  "modified": "2026-05-27T15:33:19Z",
  "published": "2026-05-27T15:33:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45981"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b2ad7ad4a28ffdb9f94e6d979b88a5b12b71681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1d4e6fb241672850296956c4d782a69363a3807"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd295a75d828c11acfcc6869c2a12cdaaf9b7722"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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