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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
3db1de0e582c358dd013f3703cd55b5fe4076436 affected < 56038756aae68312df00d4aa1d97e51ef3aca725
3db1de0e582c358dd013f3703cd55b5fe4076436 affected < a499f77c06050a28c897bdbd86cd2f0721ae0743
3db1de0e582c358dd013f3703cd55b5fe4076436 affected < a805fec35c201c59643ddcde713bce4051c8ee27
3db1de0e582c358dd013f3703cd55b5fe4076436 affected < e0288584baa5dc41df4a829a023c4c1b33fe53d7
6db52f1944417c2601182a591a704e2f119c5215 affected —
5.18.18 affected < 5.19
Linux Linux affected
Version Status Constraints
5.19 affected —
0 unaffected < 5.19
6.12.96 unaffected ≤ 6.12.*
6.18.39 unaffected ≤ 6.18.*
7.1.3 unaffected ≤ 7.1.*
7.2-rc1 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725 cve-icon
https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743 cve-icon
https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27 cve-icon
https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7 cve-icon
History

Sun, 19 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Description 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.
Title f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-19T12:02:15.907Z

Reserved: 2026-07-19T07:54:57.014Z

Link: CVE-2026-63816

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses

No weakness.