{"api_version":"1","generated_at":"2026-07-23T15:33:56+00:00","cve":"CVE-2026-31715","urls":{"html":"https://cve.report/CVE-2026-31715","api":"https://cve.report/api/cve/CVE-2026-31715.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31715","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31715"},"summary":{"title":"f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 14:16:21","updated_at":"2026-06-19 13:16:27"},"problem_types":["CWE-416"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","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"}}],"references":[{"url":"https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7","name":"https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad","name":"https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d","name":"https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53","name":"https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb","name":"https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5","name":"https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8","name":"https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa","name":"https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31715","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31715","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 7dbdab4430e4654db9aacef12b9b3b8b29ca25cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e ffb94770dbdfb5411be5d9f44a960b010ec890ad git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 0d40b26377f891e6dcb6efaf8ef9374c99be1b1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 1171f329cf1c175321251ac40fd126150d7ad1e8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 7be222de96c0f9eee6e65eeb017ef855ee185cfa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 963d2e24d9d92a31e6773b0f642214f10013ebf7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 188bb65f247a7a7c62f287c9a263aee3cad96fa5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 50fa53eccf9f911a5b435248a2b0bd484fd82e5e 2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.86 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.25 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.2 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"31715","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31715","cve":"CVE-2026-31715","epss":"0.000170000","percentile":"0.040610000","score_date":"2026-05-05","updated_at":"2026-05-06 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the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition."}],"providerMetadata":{"dateUpdated":"2026-06-19T11:58:02.837Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"},{"url":"https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad"},{"url":"https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"},{"url":"https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8"},{"url":"https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa"},{"url":"https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7"},{"url":"https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5"},{"url":"https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"}],"title":"f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31715","datePublished":"2026-05-01T13:56:10.591Z","dateReserved":"2026-03-09T15:48:24.133Z","dateUpdated":"2026-06-19T11:58:02.837Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 14:16:21","lastModifiedDate":"2026-06-19 13:16:27","problem_types":["CWE-416"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","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":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.25","matchCriteriaId":"8FCBD357-E27C-4208-8F7A-93061EE45D3E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.2","matchCriteriaId":"1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31715","Ordinal":"1","Title":"f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_wri","CVE":"CVE-2026-31715","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31715","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition.","Type":"Description","Title":"f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_wri"}]}}}