{"id":"CVE-2026-80979","title":"kernel: net/smc: unregister the connection before draining the rx tasklet (CVE-2026-80979)","summary":"A flaw was found in the Linux kernel's Shared Memory Communications (SMC) component. During connection termination, the SMC component may fail to properly unregister a connection before draining its receive tasklet. This can lead to a use-…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T19:08:31+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80979.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80979.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80979"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532177"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80979"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80979"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80979.mbox"},{"url":"https://git.kernel.org/stable/c/b6b6ac713ee82b340a8e3be30b101bd2840deec4"},{"url":"https://git.kernel.org/stable/c/b4d540ac95cd35c6ebab6afb7eae2bcac7b277a5"},{"url":"https://git.kernel.org/stable/c/5bd8b764a610b6b6bc0c4d3d01652747f6e0b5c3"},{"url":"https://git.kernel.org/stable/c/b74d313567dfc1b7e56629ddbad04e728686f235"},{"url":"https://git.kernel.org/stable/c/36cdf5d48ca191dcd71c28cadbe0981b1d25318d"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00128,"epssPercentile":0.0285,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.455Z","slug":"CVE-2026-80979","body":"## Overview\n\nA flaw was found in the Linux kernel's Shared Memory Communications (SMC) component. During connection termination, the SMC component may fail to properly unregister a connection before draining its receive tasklet. This can lead to a use-after-free vulnerability, where a freed memory buffer is subsequently dereferenced. A local attacker could potentially exploit this to cause a system crash, resulting in a denial of service, or potentially achieve arbitrary code execution.\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 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80979.json)\n\n**kernel: net/smc: unregister the connection before draining the rx tasklet** — 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 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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204178,"id":"CVE-2026-80979","ts":1789490236764,"field":"cvss","old":"7.8","new":"7"},{"seq":183818,"id":"CVE-2026-80979","ts":1789356677533,"field":"cvss","old":"7.8","new":"7"},{"seq":153162,"id":"CVE-2026-80979","ts":1789285349357,"field":"cvss","old":null,"new":"7.8"},{"seq":153161,"id":"CVE-2026-80979","ts":1789285349357,"field":"severity","old":"none","new":"high"},{"seq":147632,"id":"CVE-2026-80979","ts":1789270211670,"field":"cvss","old":null,"new":"7"},{"seq":147631,"id":"CVE-2026-80979","ts":1789270211670,"field":"severity","old":"none","new":"high"},{"seq":109386,"id":"CVE-2026-80979","ts":1789183731705,"field":"cvss","old":null,"new":"7"},{"seq":109385,"id":"CVE-2026-80979","ts":1789183731705,"field":"severity","old":"none","new":"high"}]}