HighFix available

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE) - shrink - f2fs_gc - gc_data_segment - ra_data_block(cow_inode) - mapping = F2FS_I(inode)->atomic_inode->i_mapping : f2fs_is_cow_file(cow_inode) is true - f2fs_evict_inode(atomic_inode) - clear_inode_flag(fi->cow_inode, FI_COW_FILE) - F2FS_I(fi->cow_inode)->atomic_inode = NULL ... - truncate_inode_pages_final(atomic_inode) - f2fs_grab_cache_folio(mapping) : create folio in atomic_inode->mapping - clear_inode(atomic_inode) - BUG_ON(atomic_inode->i_data.nrpages) We need to add a reference on fi->atomic_inode before using its mapping field during garbage collection, otherwise, it will cause UAF issue.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.12.96, 6.18.39, 6.6.145, 7.1.3
CVEs: CVE-2026-63816
Confirmed fixed CVEs: Not specified
Updated in this feed: 28 Oct 2026, 08:57 UTC · Revision 1

Source evidence

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode

core-osv · Original source

Published 19 Jul 2026, 12:02 UTC

osv:CVE-2026-63816

Kernel

Fixed versions: 6.6.145, 6.12.96, 6.18.39, 7.1.3

Complete source record

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  "id": "66e6160659d2b7659c5074d2aad60c44b321f37f17eed1cafba57d068b962f59",
  "url": "https://osv.dev/vulnerability/CVE-2026-63816",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE) - shrink - f2fs_gc - gc_data_segment - ra_data_block(cow_inode) - mapping = F2FS_I(inode)->atomic_inode->i_mapping : f2fs_is_cow_file(cow_inode) is true - f2fs_evict_inode(atomic_inode) - clear_inode_flag(fi->cow_inode, FI_COW_FILE) - F2FS_I(fi->cow_inode)->atomic_inode = NULL ... - truncate_inode_pages_final(atomic_inode) - f2fs_grab_cache_folio(mapping) : create folio in atomic_inode->mapping - clear_inode(atomic_inode) - BUG_ON(atomic_inode->i_data.nrpages) We need to add a reference on fi->atomic_inode before using its mapping field during garbage collection, otherwise, it will cause UAF issue.",
    "evidence": "osv:CVE-2026-63816",
    "products": [
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      "modified": "2026-10-08T02:51:28.596982830Z",
      "provider": "osv",
      "references": [
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  "source_id": "core-osv",
  "document_id": 98309,
  "published_at": "2026-07-19T12:02:15.907+00:00"
}