{
  "affected": [
    {
      "database_specific": {
        "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39964.json"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8ff590903d5fc7f5a0a988c38267a3d08e6393a2"
            },
            {
              "fixed": "0f28c4adbc4a97437874c9b669fd7958a8c6d6ce"
            },
            {
              "fixed": "e4c1ec11132ec466f7362a95f36a506ce4dc08c9"
            },
            {
              "fixed": "1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8"
            },
            {
              "fixed": "7c4491b5644e3a3708f3dbd7591be0a570135b84"
            },
            {
              "fixed": "9aee87da5572b3a14075f501752e209801160d3d"
            },
            {
              "fixed": "45bcf60fe49b37daab1acee57b27211ad1574042"
            },
            {
              "fixed": "1b34cbbf4f011a121ef7b2d7d6e6920a036d5285"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "database_specific": {
        "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39964.json"
      },
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.38"
            },
            {
              "fixed": "5.10.245"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.194"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.154"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.16.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39964.json"
  },
  "details": "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.",
  "id": "CVE-2025-39964",
  "modified": "2026-10-28T02:30:30.630733932Z",
  "published": "2025-10-13T13:48:30.334Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39964"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39964.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39964"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "related": [
    "ALSA-2026:70402",
    "ALSA-2026:70403",
    "ALSA-2026:70459",
    "ALSA-2026:70498",
    "SUSE-SU-2026:0962-1",
    "SUSE-SU-2026:1041-1",
    "SUSE-SU-2026:1078-1",
    "SUSE-SU-2026:1081-1",
    "SUSE-SU-2026:20667-1",
    "SUSE-SU-2026:20720-1",
    "SUSE-SU-2026:20838-1",
    "SUSE-SU-2026:20845-1",
    "SUSE-SU-2026:20873-1",
    "SUSE-SU-2026:20876-1",
    "SUSE-SU-2026:20931-1",
    "SUSE-SU-2026:21284-1",
    "SUSE-SU-2026:23066-1",
    "SUSE-SU-2026:23068-1",
    "SUSE-SU-2026:23221-1",
    "SUSE-SU-2026:23231-1",
    "SUSE-SU-2026:23237-1",
    "SUSE-SU-2026:23477-1",
    "SUSE-SU-2026:23481-1",
    "SUSE-SU-2026:23528-1",
    "SUSE-SU-2026:23529-1",
    "SUSE-SU-2026:4120-1",
    "SUSE-SU-2026:4282-1",
    "SUSE-SU-2026:4665-1",
    "SUSE-SU-2026:4666-1",
    "SUSE-SU-2026:4667-1",
    "SUSE-SU-2026:4668-1",
    "openSUSE-SU-2026:20416-1",
    "openSUSE-SU-2026:21555-1"
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg"
}