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CVE-2026-63816

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 3db1de0e582c358dd013f3703cd55b5fe4076436 before 7d3ae21783e5914c1761ac7d63f882d3d70800e9; affected 3db1de0e582c358dd013f3703cd55b5fe4076436 before 56038756aae68312df00d4aa1d97e51ef3aca725; affected 3db1de0e582c358dd013f3703cd55b5fe4076436 before a499f77c06050a28c897bdbd86cd2f0721ae0743; affected 3db1de0e582c358dd013f3703cd55b5fe4076436 before a805fec35c201c59643ddcde713bce4051c8ee27; affected 3db1de0e582c358dd013f3703cd55b5fe4076436 before e0288584baa5dc41df4a829a023c4c1b33fe53d7; affected 6db52f1944417c2601182a591a704e2f119c5215; affected 5.18.18 before 5.19
Linux / Linuxaffected 5.19; unaffected 0 before 5.19; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.3 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References