CVE-2025-21836 (GCVE-0-2025-21836)
Vulnerability from cvelistv5
Published
2025-03-07 09:09
Modified
2025-05-04 07:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/146a185f6c05ee263db715f860620606303c4633
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d0dc28dae836caf7645fef62a10befc624dd17b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603
Impacted products
Vendor Product Version
Linux Linux Version: 2fcabce2d7d34f69a888146dab15b36a917f09d4
Version: 2fcabce2d7d34f69a888146dab15b36a917f09d4
Version: 2fcabce2d7d34f69a888146dab15b36a917f09d4
Version: 2fcabce2d7d34f69a888146dab15b36a917f09d4
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   Linux Linux Version: 5.19
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{
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          "product": "Linux",
          "programFiles": [
            "io_uring/kbuf.c"
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              "operator": "OR"
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      "descriptions": [
        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/kbuf: reallocate buf lists on upgrade\n\nIORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it\nwas created for legacy selected buffer and has been emptied. It violates\nthe requirement that most of the field should stay stable after publish.\nAlways reallocate it instead."
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:22:09.559Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603"
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      "title": "io_uring/kbuf: reallocate buf lists on upgrade",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21836",
    "datePublished": "2025-03-07T09:09:56.127Z",
    "dateReserved": "2024-12-29T08:45:45.777Z",
    "dateUpdated": "2025-05-04T07:22:09.559Z",
    "state": "PUBLISHED"
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  }
}


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