CVE-2026-45981 (GCVE-0-2026-45981)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-06-01 16:16
VLAI
Title
s390/cio: Fix device lifecycle handling in css_alloc_subchannel()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 (git)
Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 (git)
Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < 6715560527e343a387e4a0d2e6c401748e89fa55 (git)
Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 (git)
Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/s390/cio/css.c"
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        "shortName": "Linux"
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    "datePublished": "2026-05-27T12:18:39.923Z",
    "dateReserved": "2026-05-13T15:03:33.090Z",
    "dateUpdated": "2026-06-01T16:16:41.646Z",
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  }
}


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