Linux Kernel up to 7.2-rc1 ipv6 fib6_dump_table.isra fib6_walk_continue args null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.2-rc1. This affects the function fib6_walk_continue of the file fib6_dump_table.isra of the component ipv6. The manipulation of the argument args leads to null pointer dereference. This vulnerability is referenced as CVE-2026-72392. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.2-rc1. This issue affects the function fib6_walk_continue of the file fib6_dump_table.isra of the component ipv6. The manipulation of the argument args with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-72392 since 08/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.15.212, 6.6.151, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc2 eliminates this vulnerability. Applying the patch 89f9c5fee3c64c5cabc34e65599308fd3c879cf9/27210d433a8c5fe6bf7278a04bbaeb49a81d0290/059efb48dd746518898faaa9b965511009b59639/d8a01d27873e04bebd357dc87859aa756e0b28b2/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae/9facb861dc6b9b9ea9793ef5032a9a826f7a4229 is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.212/6.6.151/6.12.97/6.18.40/7.1.5/7.2-rc2
Patch: 89f9c5fee3c64c5cabc34e65599308fd3c879cf9/27210d433a8c5fe6bf7278a04bbaeb49a81d0290/059efb48dd746518898faaa9b965511009b59639/d8a01d27873e04bebd357dc87859aa756e0b28b2/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae/9facb861dc6b9b9ea9793ef5032a9a826f7a4229

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72392 (🔒)
GCVE (CVE): GCVE-0-2026-72392
GCVE (VulDB): GCVE-100-390755

Entryinfo

Created: 08/15/2026 14:46
Changes: 08/15/2026 14:46 (61)
Complete: 🔍
Cache ID: 216::103

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