FKIE_CVE-2026-45981

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b2ad7ad4a28ffdb9f94e6d979b88a5b12b71681
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b1d4e6fb241672850296956c4d782a69363a3807
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd295a75d828c11acfcc6869c2a12cdaaf9b7722
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-45981",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:15.233",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b2ad7ad4a28ffdb9f94e6d979b88a5b12b71681"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1d4e6fb241672850296956c4d782a69363a3807"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fd295a75d828c11acfcc6869c2a12cdaaf9b7722"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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