{"id":"CVE-2026-72392","summary":"ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump\n\ninet6_dump_fib() saves its progress in cb-\u003eargs[1] as a positional\nindex within the current hash chain.  Between batches, a concurrent\nfib6_new_table() can insert a new table at the chain head, shifting\nall existing entries.  The saved index then lands on a different\ntable, causing fib6_dump_table() to set w-\u003eroot to the wrong table\nwhile w-\u003enode still points into the previous one.\nfib6_walk_continue() dereferences w-\u003enode-\u003eparent (NULL) and panics:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  RIP: 0010:fib6_walk_continue+0x6e/0x170\n  Call Trace:\n   \u003cTASK\u003e\n   fib6_dump_table.isra.0+0xc5/0x240\n   inet6_dump_fib+0xf6/0x420\n   rtnl_dumpit+0x30/0xa0\n   netlink_dump+0x15b/0x460\n   netlink_recvmsg+0x1d6/0x2a0\n   ____sys_recvmsg+0x17a/0x190\n\nFix by storing tb-\u003etb6_id in cb-\u003eargs[1] instead of a positional\nindex.  On resume, skip entries until the id matches; a concurrent\nhead-insert can never match the saved id, so the walker always\nresumes on the correct table.","modified":"2026-08-16T03:48:41.013286065Z","published":"2026-08-15T05:56:20.463Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72392.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/059efb48dd746518898faaa9b965511009b59639"},{"type":"WEB","url":"https://git.kernel.org/stable/c/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27210d433a8c5fe6bf7278a04bbaeb49a81d0290"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89f9c5fee3c64c5cabc34e65599308fd3c879cf9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8a01d27873e04bebd357dc87859aa756e0b28b2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72392.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72392"},{"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":"1b43af5480c351dbcb2eef478bafe179cbeb6e83"},{"fixed":"89f9c5fee3c64c5cabc34e65599308fd3c879cf9"},{"fixed":"27210d433a8c5fe6bf7278a04bbaeb49a81d0290"},{"fixed":"059efb48dd746518898faaa9b965511009b59639"},{"fixed":"d8a01d27873e04bebd357dc87859aa756e0b28b2"},{"fixed":"110ccbd28c9444866fcc84ba96a2ad64fa6e95ae"},{"fixed":"9facb861dc6b9b9ea9793ef5032a9a826f7a4229"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72392.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.19"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72392.json"}}],"schema_version":"1.9.0"}