{"id":"CVE-2026-89559","title":"kernel: libnvdimm/labels: Prevent integer overflow in __nd_label_validate() (CVE-2026-89559)","summary":"A flaw was found in the Linux kernel's `libnvdimm/labels` component. An integer overflow vulnerability exists in the `__nd_label_validate()` function, where a 32-bit calculation of a namespace index field (`nslot`) can wrap around. This al…","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-787","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T16:23:30+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89559"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532126"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89559"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89559"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89559.mbox"},{"url":"https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe"},{"url":"https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4"},{"url":"https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c"},{"url":"https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278"},{"url":"https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586"},{"url":"https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856"},{"url":"https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b"},{"url":"https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00164,"epssPercentile":0.06027,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89559","body":"## Overview\n\nA flaw was found in the Linux kernel's `libnvdimm/labels` component. An integer overflow vulnerability exists in the `__nd_label_validate()` function, where a 32-bit calculation of a namespace index field (`nslot`) can wrap around. This allows a local attacker, or an attacker with control over the storage medium, to provide a specially crafted `nslot` value. This crafted value can bypass security checks, leading to an out-of-bounds write and potential memory corruption.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json)\n\n**kernel: libnvdimm/labels: Prevent integer overflow in __nd_label_validate()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\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\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nFix deferred","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205539,"id":"CVE-2026-89559","ts":1789576724537,"field":"cvss","old":"7.8","new":"7"},{"seq":197922,"id":"CVE-2026-89559","ts":1789384320962,"field":"cvss","old":"6","new":"7.8"},{"seq":197921,"id":"CVE-2026-89559","ts":1789384320962,"field":"severity","old":"medium","new":"high"},{"seq":183473,"id":"CVE-2026-89559","ts":1789356675510,"field":"cvss","old":"7.8","new":"6"},{"seq":183472,"id":"CVE-2026-89559","ts":1789356675510,"field":"severity","old":"high","new":"medium"},{"seq":153370,"id":"CVE-2026-89559","ts":1789285350243,"field":"cvss","old":null,"new":"7.8"},{"seq":153369,"id":"CVE-2026-89559","ts":1789285350243,"field":"severity","old":"none","new":"high"},{"seq":147710,"id":"CVE-2026-89559","ts":1789270211973,"field":"cvss","old":null,"new":"6"},{"seq":147709,"id":"CVE-2026-89559","ts":1789270211973,"field":"severity","old":"none","new":"medium"},{"seq":109464,"id":"CVE-2026-89559","ts":1789183732016,"field":"cvss","old":null,"new":"6"},{"seq":109463,"id":"CVE-2026-89559","ts":1789183732016,"field":"severity","old":"none","new":"medium"}]}