{"id":"CVE-2026-99073","summary":"ipv4: stop exception dump when nexthop group shrinks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: stop exception dump when nexthop group shrinks\n\nCommit 4ce5dc9316de (\"inet: switch inet_dump_fib() to RCU\nprotection\") allowed IPv4 FIB dumps to run concurrently with nexthop\nreplacement.\n\nfib_dump_info_fnhe() uses fib_info_num_path() as the loop bound,\nthen fib_info_nhc() independently reloads nh-\u003enh_grp. If\nRTM_NEWNEXTHOP replaces a group with fewer paths between those loads,\nfib_info_nhc() returns NULL and the dump dereferences it through\nnhc_flags.\n\nStop the walk when the indexed path is absent. Nexthop groups are\ndense, so the current snapshot has no later path.","modified":"2026-10-25T02:47:29.016939442Z","published":"2026-10-23T12:23:16.935Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99073.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21cba134c30c17ae55f468b5809336437df5d7e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9a30bb7b831e8c5a47fadbdf1760918aaf009cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f91e472821e32f58b03eb631e20a67157e2b928b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99073.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99073"},{"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":"4ce5dc9316de50e0da84beafe55d1344f829cece"},{"fixed":"f91e472821e32f58b03eb631e20a67157e2b928b"},{"fixed":"21cba134c30c17ae55f468b5809336437df5d7e6"},{"fixed":"b9a30bb7b831e8c5a47fadbdf1760918aaf009cc"},{"fixed":"4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99073.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99073.json"}}],"schema_version":"1.9.2"}