{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "52fcbb92e0d3acfd1448b2a43b6595d540da5295"
            },
            {
              "fixed": "a89cc145832e81c32199d4ca2e1ea8bd51ed601d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "da29cd197246c85c0473259f1cad897d9d28faea"
            },
            {
              "fixed": "993e0158331d37c04da18efe551b5e1e35fb3078"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "a6f4cfa3783804336491e0edcb250c25f9b59d33"
            },
            {
              "fixed": "f751d6e39d4c937c45f8fedc66699aa7d2d52288"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
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              "introduced": "571204e4758a528fbd67330bd4b0dfbdafb33dd8"
            },
            {
              "fixed": "84c2d8e807ac489f5c91769293fb15dfdae8bae8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5d510ac31626ed157d2182149559430350cf2104"
            },
            {
              "fixed": "07a9e289ff7edcc004f58952405f8a65c4e37512"
            },
            {
              "fixed": "d40c24634fe077a0dc91fd11fccf44ce12b454d5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.160"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.120"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.64"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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              "introduced": "6.18.3"
            },
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              "fixed": "6.18.52"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90176.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Do not skip lock checks for single-byte ranges\n\ncheck_lock_range() uses inclusive ranges. Its callers pass the end\noffset as start + length - 1, so start == end represents a valid\nsingle-byte range rather than an empty range.\n\nThe start == end shortcut therefore skips mandatory byte-range lock\nchecks for one-byte reads, writes, copychunk operations and one-byte\ntruncate ranges. A conflicting lock covering that byte is not checked\nand the operation is allowed to proceed.\n\nRemove the shortcut. The truncate size == inode-\u003ei_size case is already\nhandled by only calling check_lock_range() when the new size differs\nfrom the current file size.",
  "id": "CVE-2026-90176",
  "modified": "2026-09-18T03:30:39.237997537Z",
  "published": "2026-09-17T16:07:02.433Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07a9e289ff7edcc004f58952405f8a65c4e37512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84c2d8e807ac489f5c91769293fb15dfdae8bae8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/993e0158331d37c04da18efe551b5e1e35fb3078"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a89cc145832e81c32199d4ca2e1ea8bd51ed601d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d40c24634fe077a0dc91fd11fccf44ce12b454d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f751d6e39d4c937c45f8fedc66699aa7d2d52288"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90176.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90176"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ksmbd: Do not skip lock checks for single-byte ranges"
}