s390/zcrypt: Improve EP11 CPRB length and overflow checks

{
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  "url": "https://osv.dev/vulnerability/CVE-2026-80545",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/zcrypt: Improve EP11 CPRB length and overflow checks",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve EP11 CPRB length and overflow checks The xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Missing minimum size validation: The ep11_cprb structure and subsequent payload fields (pld_tag, pld_lenfmt) are copied from userspace without verifying sufficient buffer length. 2. Arithmetic overflow in length calculations: CEIL4 alignment could overflow, bypassing size checks and enabling buffer overflows. 3. The payload is asn1 encoded but the function just uses a simple c struct overlay to access some fields of the payload. Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, and validating minimum request size and minimum reply size before copying from userspace. Do a very simple asn1 parsing of the payload up to the function value field.",
    "evidence": "osv:CVE-2026-80545",
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          "value": "Kernel",
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-80545",
      "aliases": [
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      "modified": "2026-10-28T02:30:22.872138097Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/17ac0bc866fc624cd05f022dcd8b730c0af11bb1",
        "https://git.kernel.org/stable/c/2976b9d2e716c7e5487ca7c29a7bd076cf9adf08",
        "https://git.kernel.org/stable/c/f463f474773aa49ed1d6087d95d44cea7099fdc7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80545.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80545",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80545.json"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 489292,
  "published_at": "2026-08-26T14:37:16.956+00:00"
}