{"id":"CVE-2026-31678","title":"openvswitch: defer tunnel netdev_put to RCU release","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: defer tunnel netdev_put to RCU release\n\novs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already\ndetached the device. Dropping the netdev refere…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc","Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 42f0d3d81209654c08ffdde5a34b9b92d2645896","Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < bbe7bd722bfaea36aab3da6cc60fb4a05c644643","Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 98b726ab5e2a4811e27c28e4d041f75bba147eab","Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < b8c56a3fc5d879c0928f207a756b0f067f06c6a8","Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 6931d21f87bc6d657f145798fad0bf077b82486c","Linux 4.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:12:17.787623Z"},"published":"2026-04-25","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:23.572Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31678","references":[{"url":"https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc"},{"url":"https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896"},{"url":"https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643"},{"url":"https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab"},{"url":"https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8"},{"url":"https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c"}],"tags":["cve.org"],"epss":0.00102,"epssPercentile":0.00872,"ingestedAt":"2026-10-16T17:24:46.670Z","slug":"CVE-2026-31678","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: defer tunnel netdev_put to RCU release\n\novs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already\ndetached the device. Dropping the netdev reference in destroy can race\nwith concurrent readers that still observe vport->dev.\n\nDo not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let\nvport_netdev_free() drop the reference from the RCU callback, matching\nthe non-tunnel destroy path and avoiding additional synchronization\nunder RTNL.\n\n## Affected\n\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc`\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 42f0d3d81209654c08ffdde5a34b9b92d2645896`\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < bbe7bd722bfaea36aab3da6cc60fb4a05c644643`\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 98b726ab5e2a4811e27c28e4d041f75bba147eab`\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < b8c56a3fc5d879c0928f207a756b0f067f06c6a8`\n- `Linux >= a9020fde67a6eb77f8130feff633189f99264db1 < 6931d21f87bc6d657f145798fad0bf077b82486c`\n- `Linux 4.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}