{"id":"CVE-2026-89578","title":"kernel: dm-io: clone the source bio instead of copying its biovec (CVE-2026-89578)","summary":"A flaw was found in the Linux kernel's device mapper I/O (dm-io) component. When handling DM_IO_BIO requests, incorrect sector-based accounting for misaligned direct I/O buffers could lead to an infinite loop. This issue can cause I/O oper…","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-835","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T17:54:50+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89578"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532204"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89578"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89578"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89578.mbox"},{"url":"https://git.kernel.org/stable/c/62dc37a819a5a5de5cba989ad9e96ee214b9253e"},{"url":"https://git.kernel.org/stable/c/8dc48b68d7c3e6ecaae80fc1592befb0e8603d6c"},{"url":"https://git.kernel.org/stable/c/9493ac67623d45b7d4671d2b0b4d0633c2bc2e51"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00206,"epssPercentile":0.09498,"ingestedAt":"2026-09-14T11:11:19.886Z","slug":"CVE-2026-89578","body":"## Overview\n\nA flaw was found in the Linux kernel's device mapper I/O (dm-io) component. When handling DM_IO_BIO requests, incorrect sector-based accounting for misaligned direct I/O buffers could lead to an infinite loop. This issue can cause I/O operations to hang indefinitely, resulting in a denial of service (DoS) for the affected system. A local attacker could exploit this by performing specific misaligned direct I/O operations to a dm-mirror device.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89578.json)\n\n**kernel: dm-io: clone the source bio instead of copying its biovec** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\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,"exploitation":0,"ransomware":0},"changes":[{"seq":208149,"id":"CVE-2026-89578","ts":1789922725360,"field":"cvss","old":"4.1","new":"5.5"},{"seq":204067,"id":"CVE-2026-89578","ts":1789490231289,"field":"cvss","old":null,"new":"4.1"},{"seq":204066,"id":"CVE-2026-89578","ts":1789490231289,"field":"severity","old":"none","new":"medium"},{"seq":147556,"id":"CVE-2026-89578","ts":1789270211371,"field":"cvss","old":null,"new":"4.1"},{"seq":147555,"id":"CVE-2026-89578","ts":1789270211371,"field":"severity","old":"none","new":"medium"},{"seq":109310,"id":"CVE-2026-89578","ts":1789183731376,"field":"cvss","old":null,"new":"4.1"},{"seq":109309,"id":"CVE-2026-89578","ts":1789183731376,"field":"severity","old":"none","new":"medium"}]}