{"cve":"CVE-2026-63816","nvd":{"published":"2026-07-19T12:16:54.643","modified":"2026-08-17T05:17:18.870","status":"Awaiting Analysis","description":"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_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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725","https://git.kernel.org/stable/c/7d3ae21783e5914c1761ac7d63f882d3d70800e9","https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743","https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27","https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-63816","score":0.00126,"percentile":0.02308,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}