{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7d009e048d7cfcc21d400f2aba4c8bacbdebbd47"
            },
            {
              "fixed": "2d50b6d47e5671ff6a25834c5906d443356191f0"
            },
            {
              "fixed": "dde99df5a9d3b0ca6ac0a86f98799685f7399432"
            },
            {
              "fixed": "931e1aa4d44c52ff8e0feb38420a8827c62e886b"
            },
            {
              "fixed": "0f9af07ecc1ab486038373db6ae0436c5d674b19"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89830.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix valid block count leak on data block allocation failure\n\nIn __allocate_data_block(), when allocating a new data block\n(dn-\u003edata_blkaddr == NULL_ADDR), inc_valid_block_count() is\ncalled first to increment total_valid_block_count and i_blocks.\nIf the subsequent f2fs_allocate_data_block() fails, the function\nreturns the error directly without rolling back the\nalready-incremented block counts, causing a permanent leak.\n\nFix this by calling dec_valid_block_count() to undo the\nincrement before returning the error. The condition\nold_blkaddr == NULL_ADDR precisely identifies the case where\ninc_valid_block_count() was called.",
  "id": "CVE-2026-89830",
  "modified": "2026-09-18T03:30:25.848647586Z",
  "published": "2026-09-16T10:31:02.688Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89830.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89830"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "f2fs: fix valid block count leak on data block allocation failure"
}