{"id":"CVE-2026-89745","title":"debugfs: Fix lockdown check for mmap_prepare","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndebugfs: Fix lockdown check for mmap_prepare\n\nCommit 651fdda8406d (\"relay: update relay to use mmap_prepare\")\nchanged the `mmap` file operation to `mmap_prepare` for re…","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":"Linux","product":"Linux","affected":["Linux >= 651fdda8406d42a5004c5c79f269540a85d6a1ab < e7f6a6b5741d16fdac7adaecbe0fa52ae756f208","Linux >= 651fdda8406d42a5004c5c79f269540a85d6a1ab < f81808de37338aac8e167f99bfae647b1b835c70","Linux 6.19"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:59.176Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89745","references":[{"url":"https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208"},{"url":"https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70"},{"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"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00198,"epssPercentile":0.09443,"ingestedAt":"2026-09-14T11:11:19.884Z","slug":"CVE-2026-89745","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndebugfs: Fix lockdown check for mmap_prepare\n\nCommit 651fdda8406d (\"relay: update relay to use mmap_prepare\")\nchanged the `mmap` file operation to `mmap_prepare` for relayfs, but\nthe lockdown check in debugfs was not updated accordingly.\n\nThis prevents debugfs from being locked down when the kernel is in\nintegrity mode if a file uses `mmap_prepare` but not `mmap`.\n\nSince the conversion to `mmap_prepare` across the kernel is not yet\ncomplete, update the lockdown check to look for both `mmap` and\n`mmap_prepare` to ensure comprehensive coverage.\n\n## Affected\n\n- `Linux >= 651fdda8406d42a5004c5c79f269540a85d6a1ab < e7f6a6b5741d16fdac7adaecbe0fa52ae756f208`\n- `Linux >= 651fdda8406d42a5004c5c79f269540a85d6a1ab < f81808de37338aac8e167f99bfae647b1b835c70`\n- `Linux 6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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)","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"}]}