{
  "cveId": "CVE-2026-74571",
  "url": "https://patchblox.com/security/cve/CVE-2026-74571",
  "summary": "CVE-2026-74571 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-74571, released August 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "btrfs: skip global block reserve accounting for rescue mounts",
  "description": "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\u002B0x9d/0x1c0 [btrfs]   Call Trace:    fill_dummy_bgs\u002B0xd4/0x120 [btrfs]    open_ctree\u002B0xc6e/0x1ca0 [btrfs]    btrfs_get_tree\u002B0x50d/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. ]",
  "published": "2026-08-15T13:18:02Z",
  "severity": "Moderate",
  "cvss": 4.1,
  "epss": 0.00204,
  "epssPercentile": 0.10405,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74571",
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}