{
  "document": {
    "aggregate_severity": {
      "text": "Critical"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: out-of-bounds memory access from an unbounded stack\n     allocation in the SPIR-V front end (ELSCVE-171724)\n     - debian/patches/backport-STACK_ARRAY.patch: add the upstream\n       src/util/stack_array.h helper, which the fix requires.\n     - debian/patches/CVE-2026-40393.patch: replace NIR_VLA, a bare alloca,\n       with STACK_ARRAY at the two sites whose element count comes from the\n       shader, in src/compiler/spirv/spirv_to_nir.c and\n       src/compiler/nir/nir_inline_functions.c.\n     - CVE-2026-40393",
        "title": "Details"
      }
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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
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    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787314086",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787314086"
      },
      {
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        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/advisories/2026/clsa-2026_1787314086.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-08-21T12:09:21Z",
      "generator": {
        "date": "2026-08-21T12:09:21Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1787314086",
      "initial_release_date": "2026-08-21T12:09:21Z",
      "revision_history": [
        {
          "date": "2026-08-21T12:09:21Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-40393"
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          "title": "Vulnerability description"
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