{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e"
            },
            {
              "fixed": "7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"
            },
            {
              "fixed": "ffb94770dbdfb5411be5d9f44a960b010ec890ad"
            },
            {
              "fixed": "0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"
            },
            {
              "fixed": "1171f329cf1c175321251ac40fd126150d7ad1e8"
            },
            {
              "fixed": "7be222de96c0f9eee6e65eeb017ef855ee185cfa"
            },
            {
              "fixed": "963d2e24d9d92a31e6773b0f642214f10013ebf7"
            },
            {
              "fixed": "188bb65f247a7a7c62f287c9a263aee3cad96fa5"
            },
            {
              "fixed": "2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.19.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.86"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.25"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31715.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi-\u003enr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(\u0026sbi-\u003ecp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi-\u003enode_inode)\n                                           : sbi-\u003enode_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi-\u003enode_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi-\u003enode_inode) and\nsets sbi-\u003enode_inode to NULL after sbi-\u003enr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi-\u003enr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition.",
  "id": "CVE-2026-31715",
  "modified": "2026-07-15T01:49:18.540453486Z",
  "published": "2026-05-01T13:56:10.591Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31715.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31715"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "f2fs: fix UAF caused by decrementing sbi-\u003enr_pages[] in f2fs_write_end_io()"
}