{"id":"CVE-2026-98585","title":"kernel: eth: fbnic: Avoid rounding zero ring sizes (CVE-2026-98585)","summary":"A flaw was found in the Linux kernel's fbnic network driver. A local user with administrative privileges could trigger a denial of service (DoS) and crash the system by configuring a network ring buffer size of zero. Because the driver fai…","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-1284","vendor":"Red Hat","product":"Linux","affected":["Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 < 92c9f2ea634d92adff5403d231ebeda683c5685a","Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 < 491aa3167ae02f219cb2d2de6f4196d28dca03be","Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 < 0160953d8eec75c3c55562158c46442ff1fd410b","Linux 6.15"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T04:08:55+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98585"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554997"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98585"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98585"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98585.mbox"},{"url":"https://git.kernel.org/stable/c/92c9f2ea634d92adff5403d231ebeda683c5685a"},{"url":"https://git.kernel.org/stable/c/491aa3167ae02f219cb2d2de6f4196d28dca03be"},{"url":"https://git.kernel.org/stable/c/0160953d8eec75c3c55562158c46442ff1fd410b"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.058,"ingestedAt":"2026-10-18T15:45:12.251Z","slug":"CVE-2026-98585","body":"## Overview\n\nA flaw was found in the Linux kernel's fbnic network driver. A local user with administrative privileges could trigger a denial of service (DoS) and crash the system by configuring a network ring buffer size of zero. Because the driver fails to validate the input before executing a rounding calculation, processing a zero value causes an undefined operation.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json)\n\n**kernel: eth: fbnic: Avoid rounding zero ring sizes** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225755,"id":"CVE-2026-98585","ts":1792498434114,"field":"cvss","old":null,"new":"4.4"},{"seq":225754,"id":"CVE-2026-98585","ts":1792498434114,"field":"severity","old":"none","new":"medium"}]}