{"id":"CVE-2026-43491","summary":"net: qrtr: ns: Limit the maximum server registration per node","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: ns: Limit the maximum server registration per node\n\nCurrent code does no bound checking on the number of servers added per\nnode. A malicious client can flood NEW_SERVER messages and exhaust memory.\n\nFix this issue by limiting the maximum number of server registrations to\n256 per node. If the NEW_SERVER message is received for an old port, then\ndon't restrict it as it will get replaced. While at it, also rate limit\nthe error messages in the failure path of qrtr_ns_worker().\n\nNote that the limit of 256 is chosen based on the current platform\nrequirements. If requirement changes in the future, this limit can be\nincreased.","modified":"2026-05-26T18:29:20.932302725Z","published":"2026-05-19T10:44:23.832Z","related":["openSUSE-SU-2026:10859-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43491.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/35fb4a0c077c5d1049c2628b769e0a1b1e65df0d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43491.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43491"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0c2204a4ad710d95d348ea006f14ba926e842ffd"},{"fixed":"e6f6cd501fb54060940a6eb3f4103eeb5e426ae7"},{"fixed":"3efaad55cad1ded429e3a873bfece389058a526b"},{"fixed":"35fb4a0c077c5d1049c2628b769e0a1b1e65df0d"},{"fixed":"868202aa2adae427060a42d5bd663b4d782ec02c"},{"fixed":"d5ee2ff98322337951c56398e79d51815acbf955"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43491.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.7.0"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43491.json"}}],"schema_version":"1.7.5"}