{"cve":"CVE-2026-80845","nvd":{"published":"2026-09-04T16:18:13.173","modified":"2026-10-19T09:17:19.983","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: avoid lock inversion in nat keepalive work\n\nnat_keepalive_work() walks the state table while xfrm_state_walk()\nholds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock,\nwhich conflicts with the delete path taking the same locks in reverse\norder via xfrm_state_delete() and __xfrm_state_delete(). This creates\nan AB-BA deadlock that is reported by lockdep when a NAT keepalive\nworker races with SA deletion.\n\nFix this by splitting the keepalive walk into two phases. First,\ncollect the candidate states while the walk holds xfrm_state_lock and\ntake a reference on each state. Then, after the walk completes, process\neach collected state and acquire x->lock without nesting it under\nxfrm_state_lock.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5","https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127","https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d","https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1","https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80845","score":0.00168,"percentile":0.06017,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}