{
    "id": "CVE-2025-39964",
    "published": "2025-10-13 14:15:34",
    "last_modified": "2026-09-19 04:17:48",
    "cvss_score": "7.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-362",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - Disallow concurrent writes in af_alg_sendmsg\n\nIssuing two writes to the same af_alg socket is bogus as the\ndata will be interleaved in an unpredictable fashion.  Furthermore,\nconcurrent writes may create inconsistencies in the internal\nsocket state.\n\nDisallow this by adding a new ctx->write field that indiciates\nexclusive ownership for writing.",
    "epss_score": "0.00996",
    "epss_percentile": "0.61186",
    "kev": 1,
    "kev_due": "2026-09-21",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:07:44",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-09-21."
    },
    "products": [
        {
            "vendor": "linux",
            "product": "linux_kernel"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518-4_pn\\/dp_mfp"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518-4_pn\\/dp_mfp_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518f-4_pn\\/dp_mfp"
        },
        {
            "vendor": "siemens",
            "product": "simatic_s7-1500_cpu_1518f-4_pn\\/dp_mfp_firmware"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2025-39964",
        "date_added": "2026-09-18",
        "due_date": "2026-09-21",
        "vendor": "Linux",
        "product": "Kernel",
        "name": "Linux Kernel Race Condition Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce",
        "https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285",
        "https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8",
        "https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042",
        "https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84",
        "https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d",
        "https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9",
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39964"
    ]
}