{"id":"CVE-2026-98745","title":"kernel: arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems (CVE-2026-98745)","summary":"A flaw was found in the Linux kernel. A local user can exploit this vulnerability to cause a denial of service (DoS) through a kernel crash. On ARM64 systems that support the Scalable Matrix Extension (SME) but lack the Scalable Vector Ext…","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-1288","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T03:11:02+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98745"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555184"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98745"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98745"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98745.mbox"},{"url":"https://git.kernel.org/stable/c/052acee9880114879b5c221fc8dad69b786d0938"},{"url":"https://git.kernel.org/stable/c/f2338929c7663859c0c74dd6fef2c0245066f845"},{"url":"https://git.kernel.org/stable/c/2bce6f006cfe0b60e8249fd8d51396d99355cba3"},{"url":"https://git.kernel.org/stable/c/88c1c611552b24658eb61244086691c02be2013b"},{"url":"https://git.kernel.org/stable/c/e060d9069b49fe55f38057dfe592068014652671"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05991,"ingestedAt":"2026-10-18T16:47:32.501Z","slug":"CVE-2026-98745","body":"## Overview\n\nA flaw was found in the Linux kernel. A local user can exploit this vulnerability to cause a denial of service (DoS) through a kernel crash. On ARM64 systems that support the Scalable Matrix Extension (SME) but lack the Scalable Vector Extension (SVE), the kernel improperly validates vector signal contexts during restoration. By supplying a specially crafted signal frame, an attacker can place the system into an invalid state, triggering a fatal processor exception.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98745.json)\n\n**kernel: arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228206,"id":"CVE-2026-98745","ts":1792758186833,"field":"cvss","old":null,"new":"5.5"},{"seq":228205,"id":"CVE-2026-98745","ts":1792758186833,"field":"severity","old":"none","new":"medium"}]}