{"id":"CVE-2026-63816","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode\n\n- ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE)\t\t- shrink\n - f2fs_gc\n  - gc_data_segment\n   - ra_data_block(cow_ino…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode\n\n- ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE)\t\t- shrink\n - f2fs_gc\n  - gc_data_segment\n   - ra_data_block(cow_ino…","severity":"none","published":"2026-07-19","updated":"2026-07-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63816","references":[{"url":"https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"ingestedAt":"2026-07-20T11:37:38.851Z","epss":0.00126,"epssPercentile":0.01952,"slug":"CVE-2026-63816","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode\n\n- ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE)\t\t- shrink\n - f2fs_gc\n  - gc_data_segment\n   - ra_data_block(cow_inode)\n    - mapping = F2FS_I(inode)->atomic_inode->i_mapping\n    : f2fs_is_cow_file(cow_inode) is true\n\t\t\t\t\t\t - f2fs_evict_inode(atomic_inode)\n\t\t\t\t\t\t  - clear_inode_flag(fi->cow_inode, FI_COW_FILE)\n\t\t\t\t\t\t  - F2FS_I(fi->cow_inode)->atomic_inode = NULL\n\t\t\t\t\t\t  ...\n\t\t\t\t\t\t  - truncate_inode_pages_final(atomic_inode)\n    - f2fs_grab_cache_folio(mapping)\n    : create folio in atomic_inode->mapping\n\t\t\t\t\t\t  - clear_inode(atomic_inode)\n\t\t\t\t\t\t   - BUG_ON(atomic_inode->i_data.nrpages)\n\nWe need to add a reference on fi->atomic_inode before using its mapping\nfield during garbage collection, otherwise, it will cause UAF issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}