{"api_version":"1","generated_at":"2026-07-23T15:44:27+00:00","cve":"CVE-2025-21887","urls":{"html":"https://cve.report/CVE-2025-21887","api":"https://cve.report/api/cve/CVE-2025-21887.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-21887","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-21887"},"summary":{"title":"ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up","description":"In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\n\nThe issue was caused by dput(upper) being called before\novl_dentry_update_reval(), while upper->d_flags was still\naccessed in ovl_dentry_remote().\n\nMove dput(upper) after its last use to prevent use-after-free.\n\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\n...\n </TASK>","state":"PUBLISHED","assigner":"Linux","published_at":"2025-03-27 15:15:56","updated_at":"2026-07-14 13:17:26"},"problem_types":["CWE-416","CWE-416 CWE-416 Use After 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ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\n...\n </TASK>"}],"providerMetadata":{"dateUpdated":"2026-05-23T15:57:20.970Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f77618291836168eca99e89cd175256f928f5e64"},{"url":"https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799"},{"url":"https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35"},{"url":"https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00"},{"url":"https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8"},{"url":"https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7"},{"url":"https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27"}],"title":"ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-21887","datePublished":"2025-03-27T14:57:14.524Z","dateReserved":"2024-12-29T08:45:45.782Z","dateUpdated":"2026-07-14T12:40:26.912Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-03-27 15:15:56","lastModifiedDate":"2026-07-14 13:17:26","problem_types":["CWE-416","CWE-416 CWE-416 Use After 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Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.188","versionEndExcluding":"5.11","matchCriteriaId":"6D42E8C7-CD33-432A-AC09-DC524C88ECE4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.121","versionEndExcluding":"5.15.179","matchCriteriaId":"C9B8E6A5-F0A2-421F-A00D-2CCDFDC86847"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.39","versionEndExcluding":"6.1.130","matchCriteriaId":"262D590B-5E13-4E7C-A88A-4C5A41908A0E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3.13","versionEndExcluding":"6.4","matchCriteriaId":"9058C05B-5440-4D83-834D-2E94FC46621C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.4","versionEndExcluding":"6.6.81","matchCriteriaId":"D6B5A28B-A3A7-4D06-830C-DF7654268C9D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.18","matchCriteriaId":"3D5C8D9A-4013-4C1A-810F-AA540BB5737C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.13.6","matchCriteriaId":"64F12D9B-71C2-4CD7-A288-0D5EF1709620"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*","matchCriteriaId":"186716B6-2B66-4BD0-852E-D48E71C0C85F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*","matchCriteriaId":"0D3E781C-403A-498F-9DA9-ECEE50F41E75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*","matchCriteriaId":"66619FB8-0AAF-4166-B2CF-67B24143261D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*","matchCriteriaId":"D3D6550E-6679-4560-902D-AF52DCFE905B"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"21887","Ordinal":"1","Title":"ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_","CVE":"CVE-2025-21887","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"21887","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\n\nThe issue was caused by dput(upper) being called before\novl_dentry_update_reval(), while upper->d_flags was still\naccessed in ovl_dentry_remote().\n\nMove dput(upper) after its last use to prevent use-after-free.\n\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\n...\n </TASK>","Type":"Description","Title":"ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_"}]}}}