High 7.8Published Jul 19, 2026

CVE-2026-63816f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode

Updated under an hour ago (Oct 28, 2026, 4:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Awaiting Analysis
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 3db1de0e582c358dd013f3703cd55b5fe4076436 before 7d3ae21783e5914c1761ac7d63f882d3d70800e9; from 3db1de0e582c358dd013f3703cd55b5fe4076436 before 56038756aae68312df00d4aa1d97e51ef3aca725; from 3db1de0e582c358dd013f3703cd55b5fe4076436 before a499f77c06050a28c897bdbd86cd2f0721ae0743; from 3db1de0e582c358dd013f3703cd55b5fe4076436 before a805fec35c201c59643ddcde713bce4051c8ee27; from 3db1de0e582c358dd013f3703cd55b5fe4076436 before e0288584baa5dc41df4a829a023c4c1b33fe53d7; 6db52f1944417c2601182a591a704e2f119c5215; from 5.18.18 before 5.19	CNA record

References

References

https://git.kernel.org/stable/c/7d3ae21783e5914c1761ac7d63f882d3d70800e9
https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725
https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743
https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27
https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.