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CVE-2026-72392 (GCVE-0-2026-72392)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-19 16:36
VLAI
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: 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < ee73a32dd258d4af66831ff006b771e19812b322 (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < 89f9c5fee3c64c5cabc34e65599308fd3c879cf9 (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < cb90a774a9c6c46961a44949a246fbb61f5f934c (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < 27210d433a8c5fe6bf7278a04bbaeb49a81d0290 (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < 059efb48dd746518898faaa9b965511009b59639 (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < d8a01d27873e04bebd357dc87859aa756e0b28b2 (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae (git)
Affected: 1b43af5480c351dbcb2eef478bafe179cbeb6e83 , < 9facb861dc6b9b9ea9793ef5032a9a826f7a4229 (git)
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Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
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          "lang": "en",
          "value": "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."
        }
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        {
          "url": "https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229"
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      ],
      "title": "ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump",
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    "dateReserved": "2026-08-09T03:40:39.924Z",
    "dateUpdated": "2026-08-19T16:36:33.417Z",
    "state": "PUBLISHED"
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      "title": "ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72392.json",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_fib.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"ee73a32dd258d4af66831ff006b771e19812b322\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"89f9c5fee3c64c5cabc34e65599308fd3c879cf9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"cb90a774a9c6c46961a44949a246fbb61f5f934c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"27210d433a8c5fe6bf7278a04bbaeb49a81d0290\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"059efb48dd746518898faaa9b965511009b59639\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"d8a01d27873e04bebd357dc87859aa756e0b28b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"110ccbd28c9444866fcc84ba96a2ad64fa6e95ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b43af5480c351dbcb2eef478bafe179cbeb6e83\",\"lessThan\":\"9facb861dc6b9b9ea9793ef5032a9a826f7a4229\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_fib.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/059efb48dd746518898faaa9b965511009b59639\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/27210d433a8c5fe6bf7278a04bbaeb49a81d0290\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89f9c5fee3c64c5cabc34e65599308fd3c879cf9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb90a774a9c6c46961a44949a246fbb61f5f934c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8a01d27873e04bebd357dc87859aa756e0b28b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee73a32dd258d4af66831ff006b771e19812b322\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:43:33+00:00",
      "cve": "CVE-2026-72392",
      "id": "CVE-2026-72392",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72392.json",
      "version": "3"
    }
  }
}



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