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NVD / CVE Program· CNA Linux

CVE-2026-72392: ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 059efb48dd746518898faaa9b965511009b59639, 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae, 27210d433a8c5fe6bf7278a04bbaeb49a81d0290; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.

Low priority for now. Upgrade to Linux Linux 059efb48dd746518898faaa9b965511009b59639, 110ccbd28c9444866fcc84ba96a2ad64fa6e95ae, 27210d433a8c5fe6bf7278a04bbaeb49a81d0290; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.19affected
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before ee73a32dd258d4af66831ff006b771e19812b322affected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before 89f9c5fee3c64c5cabc34e65599308fd3c879cf9affected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before cb90a774a9c6c46961a44949a246fbb61f5f934caffected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before 27210d433a8c5fe6bf7278a04bbaeb49a81d0290affected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before 059efb48dd746518898faaa9b965511009b59639affected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before d8a01d27873e04bebd357dc87859aa756e0b28b2affected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before 110ccbd28c9444866fcc84ba96a2ad64fa6e95aeaffected · git
    • 1b43af5480c351dbcb2eef478bafe179cbeb6e83 and later · before 9facb861dc6b9b9ea9793ef5032a9a826f7a4229affected · git
    • before 2.6.19not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-72389Aug 15, 2026 · bridge: stp: Fix a potential use-after-free when deleting a bridge
    31Monitor
  • ← EarlierCVE-2026-72390Aug 15, 2026 · net/sched: sch_teql: Introduce slaves_lock to avoid race condition and UAF
    31Monitor
  • Later →CVE-2026-72395Aug 15, 2026 · hwmon: (pmbus) Fix passing events to regulator core
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux059efb48dd746518898faaa9b965511009b59639Vendor (CNA)
Linux Linux110ccbd28c9444866fcc84ba96a2ad64fa6e95aeVendor (CNA)
Linux Linux27210d433a8c5fe6bf7278a04bbaeb49a81d0290Vendor (CNA)
Linux Linux89f9c5fee3c64c5cabc34e65599308fd3c879cf9Vendor (CNA)
Linux Linux9facb861dc6b9b9ea9793ef5032a9a826f7a4229Vendor (CNA)
Linux Linuxcb90a774a9c6c46961a44949a246fbb61f5f934cVendor (CNA)
Linux Linuxd8a01d27873e04bebd357dc87859aa756e0b28b2Vendor (CNA)
Linux Linuxee73a32dd258d4af66831ff006b771e19812b322Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records