CVE-2026-72392None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump inet6_dump_fib() saves its progress in cb->args[1] as a positional index within the current hash…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump
inet6_dump_fib() saves its progress in cb->args[1] as a positional index within the current hash chain. Between batches, a concurrent fib6_new_table() can insert a new table at the chain head, shifting all existing entries. The saved index then lands on a different table, causing fib6_dump_table() to set w->root to the wrong table while w->node still points into the previous one. fib6_walk_continue() dereferences w->node->parent (NULL) and panics:
BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:fib6_walk_continue+0x6e/0x170 Call Trace: <TASK> fib6_dump_table.isra.0+0xc5/0x240 inet6_dump_fib+0xf6/0x420 rtnl_dumpit+0x30/0xa0 netlink_dump+0x15b/0x460 netlink_recvmsg+0x1d6/0x2a0 ____sys_recvmsg+0x17a/0x190
Fix by storing tb->tb6_id in cb->args[1] instead of a positional index. On resume, skip entries until the id matches; a concurrent head-insert can never match the saved id, so the walker always resumes on the correct table.
Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < ee73a32dd258d4af66831ff006b771e19812b322Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 89f9c5fee3c64c5cabc34e65599308fd3c879cf9Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < cb90a774a9c6c46961a44949a246fbb61f5f934cLinux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 27210d433a8c5fe6bf7278a04bbaeb49a81d0290Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 059efb48dd746518898faaa9b965511009b59639Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < d8a01d27873e04bebd357dc87859aa756e0b28b2Linux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 110ccbd28c9444866fcc84ba96a2ad64fa6e95aeLinux >= 1b43af5480c351dbcb2eef478bafe179cbeb6e83 < 9facb861dc6b9b9ea9793ef5032a9a826f7a4229Linux 2.6.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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