FKIE_CVE-2026-72392
Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-19 17:21
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv6/ip6_fib.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ee73a32dd258d4af66831ff006b771e19812b322",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "89f9c5fee3c64c5cabc34e65599308fd3c879cf9",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "cb90a774a9c6c46961a44949a246fbb61f5f934c",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "27210d433a8c5fe6bf7278a04bbaeb49a81d0290",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "059efb48dd746518898faaa9b965511009b59639",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "d8a01d27873e04bebd357dc87859aa756e0b28b2",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "110ccbd28c9444866fcc84ba96a2ad64fa6e95ae",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
},
{
"lessThan": "9facb861dc6b9b9ea9793ef5032a9a826f7a4229",
"status": "affected",
"version": "1b43af5480c351dbcb2eef478bafe179cbeb6e83",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv6/ip6_fib.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"lessThan": "2.6.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"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."
}
],
"id": "CVE-2026-72392",
"lastModified": "2026-08-19T17:21:00.820",
"metrics": {},
"published": "2026-08-15T06:22:12.733",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Loading…
Loading…