{"api_version":"1","generated_at":"2026-07-24T19:07:58+00:00","cve":"CVE-2026-63816","urls":{"html":"https://cve.report/CVE-2026-63816","api":"https://cve.report/api/cve/CVE-2026-63816.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63816","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63816"},"summary":{"title":"f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 12:16:54","updated_at":"2026-07-24 15:19:04"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7","name":"https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725","name":"https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27","name":"https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743","name":"https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7d3ae21783e5914c1761ac7d63f882d3d70800e9","name":"https://git.kernel.org/stable/c/7d3ae21783e5914c1761ac7d63f882d3d70800e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63816","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63816","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3db1de0e582c358dd013f3703cd55b5fe4076436 7d3ae21783e5914c1761ac7d63f882d3d70800e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3db1de0e582c358dd013f3703cd55b5fe4076436 56038756aae68312df00d4aa1d97e51ef3aca725 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3db1de0e582c358dd013f3703cd55b5fe4076436 a499f77c06050a28c897bdbd86cd2f0721ae0743 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3db1de0e582c358dd013f3703cd55b5fe4076436 a805fec35c201c59643ddcde713bce4051c8ee27 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3db1de0e582c358dd013f3703cd55b5fe4076436 e0288584baa5dc41df4a829a023c4c1b33fe53d7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6db52f1944417c2601182a591a704e2f119c5215 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18.18 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.3 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63816","cve":"CVE-2026-63816","epss":"0.001560000","percentile":"0.052170000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/f2fs/gc.c","fs/f2fs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7d3ae21783e5914c1761ac7d63f882d3d70800e9","status":"affected","version":"3db1de0e582c358dd013f3703cd55b5fe4076436","versionType":"git"},{"lessThan":"56038756aae68312df00d4aa1d97e51ef3aca725","status":"affected","version":"3db1de0e582c358dd013f3703cd55b5fe4076436","versionType":"git"},{"lessThan":"a499f77c06050a28c897bdbd86cd2f0721ae0743","status":"affected","version":"3db1de0e582c358dd013f3703cd55b5fe4076436","versionType":"git"},{"lessThan":"a805fec35c201c59643ddcde713bce4051c8ee27","status":"affected","version":"3db1de0e582c358dd013f3703cd55b5fe4076436","versionType":"git"},{"lessThan":"e0288584baa5dc41df4a829a023c4c1b33fe53d7","status":"affected","version":"3db1de0e582c358dd013f3703cd55b5fe4076436","versionType":"git"},{"status":"affected","version":"6db52f1944417c2601182a591a704e2f119c5215","versionType":"git"},{"lessThan":"5.19","status":"affected","version":"5.18.18","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/f2fs/gc.c","fs/f2fs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.3","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-24T14:34:09.322Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7d3ae21783e5914c1761ac7d63f882d3d70800e9"},{"url":"https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725"},{"url":"https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743"},{"url":"https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27"},{"url":"https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7"}],"title":"f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63816","datePublished":"2026-07-19T12:02:15.907Z","dateReserved":"2026-07-19T07:54:57.014Z","dateUpdated":"2026-07-24T14:34:09.322Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 12:16:54","lastModifiedDate":"2026-07-24 15:19:04","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63816","Ordinal":"1","Title":"f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode","CVE":"CVE-2026-63816","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63816","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode"}]}}}