CVE-2026-72392
ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < ee73a32dd258d4af66831ff006b771e19812b322 (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < 89f9c5fee3c64c5cabc34e65599308fd3c879cf9 (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < cb90a774a9c6c46961a44949a246fbb61f5f934c (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < 27210d433a8c5fe6bf7278a04bbaeb49a81d0290 (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < 059efb48dd746518898faaa9b965511009b59639 (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < d8a01d27873e04bebd357dc87859aa756e0b28b2 (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae (affected, git) ≥ 1b43af5480c351dbcb2eef478bafe179cbeb6e83; < 9facb861dc6b9b9ea9793ef5032a9a826f7a4229 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.19 (affected) ≥ 0; < 2.6.19 (unaffected, semver) ≥ 5.10.265; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.183; ≤ 6.1.* (unaffected, semver) ≥ 6.6.151; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/ee73a32dd258d4af66831ff006b771e19812b322CNA: Linux
- https://git.kernel.org/stable/c/89f9c5fee3c64c5cabc34e65599308fd3c879cf9CNA: Linux
- https://git.kernel.org/stable/c/cb90a774a9c6c46961a44949a246fbb61f5f934cCNA: Linux
- https://git.kernel.org/stable/c/27210d433a8c5fe6bf7278a04bbaeb49a81d0290CNA: Linux
- https://git.kernel.org/stable/c/059efb48dd746518898faaa9b965511009b59639CNA: Linux
- https://git.kernel.org/stable/c/d8a01d27873e04bebd357dc87859aa756e0b28b2CNA: Linux
- https://git.kernel.org/stable/c/110ccbd28c9444866fcc84ba96a2ad64fa6e95aeCNA: Linux
- https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229CNA: Linux
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