{"id":"CVE-2026-72392","title":"ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump","summary":"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->args[1] as a positional\nindex within the current hash…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < ee73a32dd258d4af66831ff006b771e19812b322","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 89f9c5fee3c64c5cabc34e65599308fd3c879cf9","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < cb90a774a9c6c46961a44949a246fbb61f5f934c","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 27210d433a8c5fe6bf7278a04bbaeb49a81d0290","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 059efb48dd746518898faaa9b965511009b59639","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < d8a01d27873e04bebd357dc87859aa756e0b28b2","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae","Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 9facb861dc6b9b9ea9793ef5032a9a826f7a4229","Linux 2.6.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:54:50.630136Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:55:26.333Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72392","references":[{"url":"https://git.kernel.org/stable/c/ee73a32dd258d4af66831ff006b771e19812b322"},{"url":"https://git.kernel.org/stable/c/89f9c5fee3c64c5cabc34e65599308fd3c879cf9"},{"url":"https://git.kernel.org/stable/c/cb90a774a9c6c46961a44949a246fbb61f5f934c"},{"url":"https://git.kernel.org/stable/c/27210d433a8c5fe6bf7278a04bbaeb49a81d0290"},{"url":"https://git.kernel.org/stable/c/059efb48dd746518898faaa9b965511009b59639"},{"url":"https://git.kernel.org/stable/c/d8a01d27873e04bebd357dc87859aa756e0b28b2"},{"url":"https://git.kernel.org/stable/c/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae"},{"url":"https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229"}],"tags":["cve.org"],"epss":0.00216,"epssPercentile":0.12136,"ingestedAt":"2026-11-06T18:00:12.578Z","slug":"CVE-2026-72392","body":"## Overview\n\nIn 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->args[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->root to the wrong table\nwhile w->node still points into the previous one.\nfib6_walk_continue() dereferences w->node->parent (NULL) and panics:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  RIP: 0010:fib6_walk_continue+0x6e/0x170\n  Call Trace:\n   <TASK>\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->tb6_id in cb->args[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.\n\n## Affected\n\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < ee73a32dd258d4af66831ff006b771e19812b322`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 89f9c5fee3c64c5cabc34e65599308fd3c879cf9`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < cb90a774a9c6c46961a44949a246fbb61f5f934c`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 27210d433a8c5fe6bf7278a04bbaeb49a81d0290`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 059efb48dd746518898faaa9b965511009b59639`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < d8a01d27873e04bebd357dc87859aa756e0b28b2`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae`\n- `Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 9facb861dc6b9b9ea9793ef5032a9a826f7a4229`\n- `Linux 2.6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}