{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.176-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.86-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.3-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix UAF caused by decrementing sbi-\u003enr_pages[] in f2fs_write_end_io()  The xfstests case \"generic/107\" and syzbot have both reported a NULL pointer dereference.  The concurrent scenario that triggers the panic is as follows:  F2FS_WB_CP_DATA write callback          umount                                         - f2fs_write_checkpoint                                          - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA) - blk_mq_end_request  - bio_endio   - f2fs_write_end_io    : dec_page_count(sbi, F2FS_WB_CP_DATA)    : wake_up(\u0026sbi-\u003ecp_wait)                                         - kill_f2fs_super                                          - kill_block_super                                           - f2fs_put_super                                            : iput(sbi-\u003enode_inode)                                            : sbi-\u003enode_inode = NULL    : f2fs_in_warm_node_list     - is_node_folio // sbi-\u003enode_inode is NULL and panic  The root cause is that f2fs_put_super() calls iput(sbi-\u003enode_inode) and sets sbi-\u003enode_inode to NULL after sbi-\u003enr_pages[F2FS_WB_CP_DATA] is decremented to zero. As a result, f2fs_in_warm_node_list() may dereference a NULL node_inode when checking whether a folio belongs to the node inode, leading to a panic.  This patch fixes the issue by calling f2fs_in_warm_node_list() before decrementing sbi-\u003enr_pages[F2FS_WB_CP_DATA], thus preventing the use-after-free condition.",
  "id": "DEBIAN-CVE-2026-31715",
  "modified": "2026-09-14T16:47:39.406737937Z",
  "published": "2026-05-01T14:16:21.637Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31715"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31715"
  ]
}