{"api_version":"1","generated_at":"2026-10-01T12:49:26+00:00","cve":"CVE-2026-100073","urls":{"html":"https://cve.report/CVE-2026-100073","api":"https://cve.report/api/cve/CVE-2026-100073.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-100073","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100073"},"summary":{"title":"ext4: fix transaction overflow during writeback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix transaction overflow during writeback\n\nCommit 95ad8ee45cdb (\"ext4: correct the reserved credits for extent\nconversion\") was correct to note that we need to reserve enough credits\nfor all extents possibly underlying a large folio. However it was too\neager to reduce the number of reserved credits. Extent conversion may\nnot only need to touch several leaf extent blocks, it may also need to\nsplit extents - for example a single large unwritten extent may need to\nbe split into many small written ones in case of sparse folio dirtying.\nThis can thus result not only in extent leaf modifications but also in a\nneed to allocate new extent tree nodes. As a result the reserved\ntransaction credits were not sufficient in some corner cases. Use\next4_meta_trans_blocks() for correct upper bound credit estimate.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 14:17:13","updated_at":"2026-09-30 14:10:59"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8","name":"https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1","name":"https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100073","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100073","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 95ad8ee45cdbc321c135a2db895d48b374ef0f87 a22464c5df5827e884a5a7d3d8fb03870e5bb6c8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 95ad8ee45cdbc321c135a2db895d48b374ef0f87 46e8e31771f4f1c5e1cdec37a889a6730e42e9f1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b6d39229bc783198222cddd31e2fbded93c8db7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16.3 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"100073","cve":"CVE-2026-100073","epss":"0.001450000","percentile":"0.031630000","score_date":"2026-09-27","updated_at":"2026-09-28 00:02:23"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ext4/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a22464c5df5827e884a5a7d3d8fb03870e5bb6c8","status":"affected","version":"95ad8ee45cdbc321c135a2db895d48b374ef0f87","versionType":"git"},{"lessThan":"46e8e31771f4f1c5e1cdec37a889a6730e42e9f1","status":"affected","version":"95ad8ee45cdbc321c135a2db895d48b374ef0f87","versionType":"git"},{"status":"affected","version":"2b6d39229bc783198222cddd31e2fbded93c8db7","versionType":"git"},{"lessThan":"6.17","status":"affected","version":"6.16.3","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ext4/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix transaction overflow during writeback\n\nCommit 95ad8ee45cdb (\"ext4: correct the reserved credits for extent\nconversion\") was correct to note that we need to reserve enough credits\nfor all extents possibly underlying a large folio. However it was too\neager to reduce the number of reserved credits. Extent conversion may\nnot only need to touch several leaf extent blocks, it may also need to\nsplit extents - for example a single large unwritten extent may need to\nbe split into many small written ones in case of sparse folio dirtying.\nThis can thus result not only in extent leaf modifications but also in a\nneed to allocate new extent tree nodes. As a result the reserved\ntransaction credits were not sufficient in some corner cases. Use\next4_meta_trans_blocks() for correct upper bound credit estimate."}],"providerMetadata":{"dateUpdated":"2026-09-25T13:06:46.185Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8"},{"url":"https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1"}],"title":"ext4: fix transaction overflow during writeback","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-100073","datePublished":"2026-09-25T13:06:46.185Z","dateReserved":"2026-09-25T10:25:14.456Z","dateUpdated":"2026-09-25T13:06:46.185Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 14:17:13","lastModifiedDate":"2026-09-30 14:10:59","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"100073","Ordinal":"1","Title":"ext4: fix transaction overflow during writeback","CVE":"CVE-2026-100073","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"100073","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix transaction overflow during writeback\n\nCommit 95ad8ee45cdb (\"ext4: correct the reserved credits for extent\nconversion\") was correct to note that we need to reserve enough credits\nfor all extents possibly underlying a large folio. However it was too\neager to reduce the number of reserved credits. Extent conversion may\nnot only need to touch several leaf extent blocks, it may also need to\nsplit extents - for example a single large unwritten extent may need to\nbe split into many small written ones in case of sparse folio dirtying.\nThis can thus result not only in extent leaf modifications but also in a\nneed to allocate new extent tree nodes. As a result the reserved\ntransaction credits were not sufficient in some corner cases. Use\next4_meta_trans_blocks() for correct upper bound credit estimate.","Type":"Description","Title":"ext4: fix transaction overflow during writeback"}]}}}