{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9c79f34f7ee71cd28272332b424ca64b2be006ab"
            },
            {
              "fixed": "df5f375a6151ef71f636da044bcef90c26697255"
            },
            {
              "fixed": "5668121974eb7f7aa82793a9d0d13abadb8904dc"
            },
            {
              "fixed": "2e5afed9503dd1d85004c09503adc2cb584c0188"
            },
            {
              "fixed": "414a0f04feb06f03523edf7e2a8be1d7f1a9b160"
            },
            {
              "fixed": "9d88391bbed76eb091cddd50b0af87b1c6f22589"
            },
            {
              "fixed": "b31da1ecf13929a8d7f8d2727843d2fe35396b75"
            },
            {
              "fixed": "d2869768eab5648e6edc05f47e0716e5328e6681"
            },
            {
              "fixed": "e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.29"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89606.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: reject too-small tag 70 packets\n\necryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the\nparsed packet body size to derive the encrypted filename size.  A\nmalformed packet with a body smaller than those fixed fields can underflow\nthat size calculation.\n\nReject tag 70 packets before the subtraction unless the body contains the\nsignature, cipher code, and at least one byte of encrypted filename data.",
  "id": "CVE-2026-89606",
  "modified": "2026-09-15T03:30:33.513788536Z",
  "published": "2026-09-11T19:45:08.832Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e5afed9503dd1d85004c09503adc2cb584c0188"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/414a0f04feb06f03523edf7e2a8be1d7f1a9b160"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5668121974eb7f7aa82793a9d0d13abadb8904dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d88391bbed76eb091cddd50b0af87b1c6f22589"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b31da1ecf13929a8d7f8d2727843d2fe35396b75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2869768eab5648e6edc05f47e0716e5328e6681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df5f375a6151ef71f636da044bcef90c26697255"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89606.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89606"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "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": "ecryptfs: reject too-small tag 70 packets"
}