s390/vfio_ccw: Free all memory if cp_init() fails

{
  "id": "81b318fee70d6758421496437ed40a0ee392c9190c1b0e31c93c4f4960f93eb2",
  "url": "https://osv.dev/vulnerability/CVE-2026-80555",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/vfio_ccw: Free all memory if cp_init() fails",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Free all memory if cp_init() fails The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory. An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program. Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.",
    "evidence": "osv:CVE-2026-80555",
    "products": [
      {
        "name": {
          "value": "Kernel",
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        },
        "prerequisites": [],
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-80555",
      "aliases": [
        "CVE-2026-80555"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
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                  "fixed": "17e01e342af74de12899c206dcc9ec90684703aa"
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      ],
      "modified": "2026-10-28T02:30:28.254258751Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/152fcb74a26804b70909381c6acc90595a0ae1c1",
        "https://git.kernel.org/stable/c/17e01e342af74de12899c206dcc9ec90684703aa",
        "https://git.kernel.org/stable/c/276bd7ed34d56c48c65c43c0b08f2ee77029b2fa",
        "https://git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748",
        "https://git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5",
        "https://git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8c",
        "https://git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75",
        "https://git.kernel.org/stable/c/f9bcff265556796834122f95de16d52a8375206c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80555.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80555",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80555.json"
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    "related_cves": [
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494989,
  "published_at": "2026-08-26T14:37:22.969+00:00"
}