{"id":"CVE-2026-89716","title":"zram: validate deflate params","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: validate deflate params\n\nWe must validate user-supplied deflate winbits before we pass it to\nzlib_deflate_workspacesize(), which triggers BUG_ON() if winbits valu…","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-617"],"vendor":"Linux","product":"Linux","affected":["Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < 923578d0f0d0703c3db61ab35dc37075ae53b0bd","Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < e23fac4ab2a5728386477b98a402a1042b21bffb","Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < ec7607ac4717ff521c9c1e9d8271c26293345513","Linux 6.16"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:29.156Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89716","references":[{"url":"https://git.kernel.org/stable/c/923578d0f0d0703c3db61ab35dc37075ae53b0bd"},{"url":"https://git.kernel.org/stable/c/e23fac4ab2a5728386477b98a402a1042b21bffb"},{"url":"https://git.kernel.org/stable/c/ec7607ac4717ff521c9c1e9d8271c26293345513"},{"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/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89716.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10638,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89716","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nzram: validate deflate params\n\nWe must validate user-supplied deflate winbits before we pass it to\nzlib_deflate_workspacesize(), which triggers BUG_ON() if winbits value is\noutside of valid ranges.\n\n## Affected\n\n- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < 923578d0f0d0703c3db61ab35dc37075ae53b0bd`\n- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < e23fac4ab2a5728386477b98a402a1042b21bffb`\n- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < ec7607ac4717ff521c9c1e9d8271c26293345513`\n- `Linux 6.16`\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 OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208966,"id":"CVE-2026-89716","ts":1790062302829,"field":"cvss","old":"4.4","new":"5.5"},{"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"}]}