{"id":"CVE-2026-89745","title":"kernel: debugfs: Fix lockdown check for mmap_prepare (CVE-2026-89745)","summary":"A flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the `mmap_prepare` operation. This oversight could allow an attacker to bypass…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-414","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T08:20:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89745.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89745.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89745"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532369"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89745"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89745"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89745.mbox"},{"url":"https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"},{"url":"https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.08435,"ingestedAt":"2026-09-14T11:11:19.884Z","slug":"CVE-2026-89745","body":"## Overview\n\nA flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the `mmap_prepare` operation. This oversight could allow an attacker to bypass kernel lockdown restrictions when the system is operating in integrity mode, potentially compromising system integrity.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · 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-2026-89745.json)\n\n**kernel: debugfs: Fix lockdown check for mmap_prepare** — rated Moderate 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":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205478,"id":"CVE-2026-89745","ts":1789576721627,"field":"cvss","old":"4.4","new":"7"},{"seq":205477,"id":"CVE-2026-89745","ts":1789576721627,"field":"severity","old":"medium","new":"high"},{"seq":203986,"id":"CVE-2026-89745","ts":1789490230927,"field":"cvss","old":null,"new":"4.4"},{"seq":203985,"id":"CVE-2026-89745","ts":1789490230927,"field":"severity","old":"none","new":"medium"},{"seq":147307,"id":"CVE-2026-89745","ts":1789270208630,"field":"cvss","old":null,"new":"4.4"},{"seq":147306,"id":"CVE-2026-89745","ts":1789270208630,"field":"severity","old":"none","new":"medium"},{"seq":109056,"id":"CVE-2026-89745","ts":1789183730137,"field":"cvss","old":null,"new":"4.4"},{"seq":109055,"id":"CVE-2026-89745","ts":1789183730137,"field":"severity","old":"none","new":"medium"}]}