{"id":"CVE-2026-89716","title":"kernel: Linux kernel zram: Denial of Service due to improper deflate parameter validation (CVE-2026-89716)","summary":"A flaw was found in the zram component of the Linux kernel. This vulnerability occurs because the system does not properly validate user-supplied deflate parameters, specifically `winbits` values. An attacker could exploit this by providin…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-617","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T05:38:06+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89716"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532456"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89716"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89716"},{"url":"https://git.kernel.org/stable/c/923578d0f0d0703c3db61ab35dc37075ae53b0bd"},{"url":"https://git.kernel.org/stable/c/e23fac4ab2a5728386477b98a402a1042b21bffb"},{"url":"https://git.kernel.org/stable/c/ec7607ac4717ff521c9c1e9d8271c26293345513"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09815,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89716","body":"## Overview\n\nA flaw was found in the zram component of the Linux kernel. This vulnerability occurs because the system does not properly validate user-supplied deflate parameters, specifically `winbits` values. An attacker could exploit this by providing malformed input, which would trigger an internal error (`BUG_ON()`) and lead to a system crash, resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json)\n\n**kernel: Linux kernel zram: Denial of Service due to improper deflate parameter validation** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203953,"id":"CVE-2026-89716","ts":1789490230777,"field":"cvss","old":null,"new":"4.4"},{"seq":203952,"id":"CVE-2026-89716","ts":1789490230777,"field":"severity","old":"none","new":"medium"},{"seq":147175,"id":"CVE-2026-89716","ts":1789270199000,"field":"cvss","old":null,"new":"4.4"},{"seq":147174,"id":"CVE-2026-89716","ts":1789270199000,"field":"severity","old":"none","new":"medium"},{"seq":108936,"id":"CVE-2026-89716","ts":1789183729620,"field":"cvss","old":null,"new":"4.4"},{"seq":108935,"id":"CVE-2026-89716","ts":1789183729620,"field":"severity","old":"none","new":"medium"}]}