{"id":"CVE-2026-80946","title":"kernel: fuse: copy request headers via a stack buffer for io-uring (CVE-2026-80946)","summary":"A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The `io-uring` transport attempts to copy request headers directly to or from user space without proper memory validation. A local attacker could exploit this…","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-501","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T16:46:21+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80946"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532123"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80946"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80946"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80946.mbox"},{"url":"https://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071"},{"url":"https://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b"},{"url":"https://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.06254,"ingestedAt":"2026-09-14T00:35:28.532Z","slug":"CVE-2026-80946","body":"## Overview\n\nA flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The `io-uring` transport attempts to copy request headers directly to or from user space without proper memory validation. A local attacker could exploit this vulnerability, leading to a kernel panic and a denial of service. This issue could also potentially result in the exposure of sensitive kernel memory.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json)\n\n**kernel: fuse: copy request headers via a stack buffer for io-uring** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\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":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202732,"id":"CVE-2026-80946","ts":1789403715345,"field":"cvss","old":null,"new":"5.5"},{"seq":202731,"id":"CVE-2026-80946","ts":1789403715345,"field":"severity","old":"none","new":"medium"},{"seq":147742,"id":"CVE-2026-80946","ts":1789270212115,"field":"cvss","old":null,"new":"5.3"},{"seq":147741,"id":"CVE-2026-80946","ts":1789270212115,"field":"severity","old":"none","new":"medium"},{"seq":109500,"id":"CVE-2026-80946","ts":1789183732154,"field":"cvss","old":null,"new":"5.3"},{"seq":109499,"id":"CVE-2026-80946","ts":1789183732154,"field":"severity","old":"none","new":"medium"}]}