{"id":"CVE-2026-89601","title":"kernel: ext2: Fix lost inode updates for IS_SYNC inodes (CVE-2026-89601)","summary":"A flaw was found in the Linux kernel's ext2 filesystem. This vulnerability occurs in the `ext2_setsize()` and `ext2_xattr_set2()` functions, where inode updates for `IS_SYNC` inodes may be lost. This happens because the `sync_inode_metadat…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-821","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T05:51:17+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89601.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89601.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89601"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532345"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89601"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89601"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89601.mbox"},{"url":"https://git.kernel.org/stable/c/356984d1a5c32e94810cbb6c8dc7d8ff2d4d919a"},{"url":"https://git.kernel.org/stable/c/5efb3350230fef831167740e69e6db2861101186"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00348,"epssPercentile":0.28495,"scores":{"vendor":6.1,"cna":8.8},"ingestedAt":"2026-09-14T15:23:07.474Z","slug":"CVE-2026-89601","body":"## Overview\n\nA flaw was found in the Linux kernel's ext2 filesystem. This vulnerability occurs in the `ext2_setsize()` and `ext2_xattr_set2()` functions, where inode updates for `IS_SYNC` inodes may be lost. This happens because the `sync_inode_metadata()` function only processes inodes that are already marked as dirty, leading to potential data corruption or loss of metadata if the inode is not unconditionally marked dirty beforehand. A local attacker could potentially exploit this to cause data integrity issues.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89601.json)\n\n**kernel: ext2: Fix lost inode updates for IS_SYNC inodes** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-16.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205492,"id":"CVE-2026-89601","ts":1789576721957,"field":"cvss","old":"6.1","new":"5.5"},{"seq":202861,"id":"CVE-2026-89601","ts":1789403732707,"field":"cvss","old":"8.8","new":"6.1"},{"seq":202860,"id":"CVE-2026-89601","ts":1789403732707,"field":"severity","old":"high","new":"medium"},{"seq":197872,"id":"CVE-2026-89601","ts":1789384320758,"field":"cvss","old":"6.1","new":"8.8"},{"seq":197871,"id":"CVE-2026-89601","ts":1789384320758,"field":"severity","old":"medium","new":"high"},{"seq":183431,"id":"CVE-2026-89601","ts":1789356675341,"field":"cvss","old":"8.8","new":"6.1"},{"seq":183430,"id":"CVE-2026-89601","ts":1789356675341,"field":"severity","old":"high","new":"medium"},{"seq":153422,"id":"CVE-2026-89601","ts":1789285350448,"field":"cvss","old":null,"new":"8.8"},{"seq":153421,"id":"CVE-2026-89601","ts":1789285350448,"field":"severity","old":"none","new":"high"},{"seq":147351,"id":"CVE-2026-89601","ts":1789270210566,"field":"cvss","old":null,"new":"6.1"},{"seq":147350,"id":"CVE-2026-89601","ts":1789270210566,"field":"severity","old":"none","new":"medium"},{"seq":109104,"id":"CVE-2026-89601","ts":1789183730319,"field":"cvss","old":null,"new":"6.1"},{"seq":109103,"id":"CVE-2026-89601","ts":1789183730319,"field":"severity","old":"none","new":"medium"}]}