s390/zcrypt: fix reference counting on zcrypt card objects

{
  "id": "5faa8f7c33f4f729af7c907e7100d147c04d92519e934a83fd67a2fd0022cd47",
  "url": "https://osv.dev/vulnerability/CVE-2024-26957",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/zcrypt: fix reference counting on zcrypt card objects",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: fix reference counting on zcrypt card objects Tests with hot-plugging crytpo cards on KVM guests with debug kernel build revealed an use after free for the load field of the struct zcrypt_card. The reason was an incorrect reference handling of the zcrypt card object which could lead to a free of the zcrypt card object while it was still in use. This is an example of the slab message: kernel: 0x00000000885a7512-0x00000000885a7513 @offset=1298. First byte 0x68 instead of 0x6b kernel: Allocated in zcrypt_card_alloc+0x36/0x70 [zcrypt] age=18046 cpu=3 pid=43 kernel: kmalloc_trace+0x3f2/0x470 kernel: zcrypt_card_alloc+0x36/0x70 [zcrypt] kernel: zcrypt_cex4_card_probe+0x26/0x380 [zcrypt_cex4] kernel: ap_device_probe+0x15c/0x290 kernel: really_probe+0xd2/0x468 kernel: driver_probe_device+0x40/0xf0 kernel: __device_attach_driver+0xc0/0x140 kernel: bus_for_each_drv+0x8c/0xd0 kernel: __device_attach+0x114/0x198 kernel: bus_probe_device+0xb4/0xc8 kernel: device_add+0x4d2/0x6e0 kernel: ap_scan_adapter+0x3d0/0x7c0 kernel: ap_scan_bus+0x5a/0x3b0 kernel: ap_scan_bus_wq_callback+0x40/0x60 kernel: process_one_work+0x26e/0x620 kernel: worker_thread+0x21c/0x440 kernel: Freed in zcrypt_card_put+0x54/0x80 [zcrypt] age=9024 cpu=3 pid=43 kernel: kfree+0x37e/0x418 kernel: zcrypt_card_put+0x54/0x80 [zcrypt] kernel: ap_device_remove+0x4c/0xe0 kernel: device_release_driver_internal+0x1c4/0x270 kernel: bus_remove_device+0x10",
    "evidence": "osv:CVE-2024-26957",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-26957",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:31.315026446Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
        "https://git.kernel.org/stable/c/394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484",
        "https://git.kernel.org/stable/c/50ed48c80fecbe17218afed4f8bed005c802976c",
        "https://git.kernel.org/stable/c/6470078ab3d8f222115e11c4ec67351f3031b3dd",
        "https://git.kernel.org/stable/c/7e500849fa558879a1cde43f80c7c048c2437058",
        "https://git.kernel.org/stable/c/9daddee03de3f231012014dab8ab2b277a116a55",
        "https://git.kernel.org/stable/c/a55677878b93e9ebc31f66d0e2fb93be5e7836a6",
        "https://git.kernel.org/stable/c/a64ab862e84e3e698cd351a87cdb504c7fc575ca",
        "https://git.kernel.org/stable/c/b7f6c3630eb3f103115ab0d7613588064f665d0d",
        "https://git.kernel.org/stable/c/befb7f889594d23e1b475720cf93efd2f77df000",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26957.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26957",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26957.json"
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        "value": "CVE-2024-26957",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497879,
  "published_at": "2024-05-01T05:19:00.134+00:00"
}