{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: skip global block reserve accounting for rescue mounts  [BUG] Mounting with rescue=ibadroots after corrupting the block group tree root triggers a NULL pointer dereference:    BUG: kernel NULL pointer dereference, address: 0000000000000100   RIP: 0010:btrfs_update_global_block_rsv+0x9d/0x1c0 [btrfs]   Call Trace:    fill_dummy_bgs+0xd4/0x120 [btrfs]    open_ctree+0xc6e/0x1ca0 [btrfs]    btrfs_get_tree+0x50d/0xa40 [btrfs]  The same crash occurs with a corrupted raid stripe tree root, via btrfs_read_block_groups() instead of fill_dummy_bgs().  [CAUSE] With rescue=ibadroots, btrfs_read_roots() allows the mount to continue when either root cannot be read, leaving the corresponding root pointer NULL while its on-disk feature bit remains set.  btrfs_update_global_block_rsv() then dereferences the missing root based on the feature bit alone.  [FIX] Rescue mounts are fully read-only and cannot start transactions, so the global reserve is never consumed. Under btrfs_is_full_ro(), mark the reserve as full and return before performing the accounting.  And since we need to check if the fs is mount fully RO, export fs_is_full_ro() as btrfs_is_full_ro(), and move it to fs.h.  [ Squash the fs_is_full_ro() export commit into this one. ]",
  "id": "DEBIAN-CVE-2026-74571",
  "modified": "2026-09-14T16:47:44.149914019Z",
  "published": "2026-08-15T13:18:02.733Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74571"
    }
  ],
  "upstream": [
    "CVE-2026-74571"
  ]
}