{"id":"CVE-2026-100073","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-100073","generatedAt":"2026-10-28T04:18:10.625Z","title":"In the Linux kernel, the following vulnerability has been resolved: ext4: fix transaction overflow during writeback Commit 95ad8ee45cdb (\"ext4: correct the reserved credits for extent conversion\") was correct to note that we need to reserve enough…","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.","published":"2026-09-25T14:17:14.000Z","lastModified":"2026-10-21T18:57:22.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-617"],"affected":["linux/linux kernel"],"epss":{"score":0.001,"percentile":0.00858,"date":"2026-10-27","history":[{"date":"2026-09-26","score":0.00145,"percentile":0.03163}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-21T19:01:34.000Z","detail":{"from":null,"score":"5.5","severity":"MEDIUM","fromSeverity":null},"summary":"Now scored CVSS 5.5 MEDIUM."},{"kind":"new","label":"New CVE","at":"2026-09-25T14:17:14.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-25T14:17:13.810Z"},"summary":"New CVE, medium severity (CVSS 5.5)."}],"references":[{"url":"https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100073","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}