{"id":"CVE-2026-80980","title":"kernel: net/smc: stop killed, freed and out_of_sync sharing a byte (CVE-2026-80980)","summary":"A flaw was found in the Linux kernel's SMC (Server Message Block over Remote Direct Memory Access) protocol implementation. A concurrency issue exists where three connection state flags (killed, freed, and out_of_sync) share a single byte …","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-366","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T19:08:36+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80980.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80980.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80980"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532124"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80980"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80980"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80980.mbox"},{"url":"https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec"},{"url":"https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9"},{"url":"https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00605,"epssPercentile":0.47356,"scores":{"vendor":4.8,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80980","body":"## Overview\n\nA flaw was found in the Linux kernel's SMC (Server Message Block over Remote Direct Memory Access) protocol implementation. A concurrency issue exists where three connection state flags (killed, freed, and out_of_sync) share a single byte in the `smc_connection` structure without proper locking mechanisms. This allows for a read-modify-write race condition when different functions attempt to modify these flags simultaneously. This could lead to incorrect connection state management, potentially causing unexpected behavior or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80980.json)\n\n**kernel: net/smc: stop killed, freed and out_of_sync sharing a byte** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\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 8\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\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204177,"id":"CVE-2026-80980","ts":1789490236483,"field":"cvss","old":"4.8","new":"5.5"},{"seq":202929,"id":"CVE-2026-80980","ts":1789403732991,"field":"cvss","old":"9.8","new":"4.8"},{"seq":202928,"id":"CVE-2026-80980","ts":1789403732991,"field":"severity","old":"critical","new":"medium"},{"seq":183596,"id":"CVE-2026-80980","ts":1789356676036,"field":"cvss","old":"9.8","new":"4.8"},{"seq":183595,"id":"CVE-2026-80980","ts":1789356676036,"field":"severity","old":"critical","new":"medium"},{"seq":153164,"id":"CVE-2026-80980","ts":1789285349365,"field":"cvss","old":null,"new":"9.8"},{"seq":153163,"id":"CVE-2026-80980","ts":1789285349365,"field":"severity","old":"none","new":"critical"},{"seq":147738,"id":"CVE-2026-80980","ts":1789270212099,"field":"cvss","old":null,"new":"4.8"},{"seq":147737,"id":"CVE-2026-80980","ts":1789270212099,"field":"severity","old":"none","new":"medium"},{"seq":109496,"id":"CVE-2026-80980","ts":1789183732138,"field":"cvss","old":null,"new":"4.8"},{"seq":109495,"id":"CVE-2026-80980","ts":1789183732138,"field":"severity","old":"none","new":"medium"}]}