Linux Kernel up to 6.12.110/6.18.52 hsr hsr_nl_ringerror/hsr_nl_nodedown improper synchronization

CVSS Meta Temp Score
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CTI Interest Score
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2.6$0-$5k0.22+

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 6.12.110/6.18.52. Affected is the function hsr_nl_ringerror/hsr_nl_nodedown of the component hsr. The manipulation results in improper synchronization. This vulnerability is cataloged as CVE-2026-97419. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.12.110/6.18.52. Affected is the function hsr_nl_ringerror/hsr_nl_nodedown of the component hsr. The manipulation with an unknown input leads to a improper synchronization vulnerability. CWE is classifying the issue as CWE-662. The product utilizes multiple threads or processes to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes. This is going to have an impact on confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: hsr: broadcast netlink notifications in the device's net namespace The HSR generic netlink family sets .netnsok = true. HSR devices can live in network namespaces other than init_net. Two async notifiers broadcast events with genlmsg_multicast(). They are hsr_nl_ringerror() and hsr_nl_nodedown(). That helper delivers only on the default genl socket in init_net. So the events always land in init_net. The network namespace of the device does not matter. This has two effects. A listener in the device's own namespace never sees its own ring error and node down events. A privileged listener in init_net receives events from HSR devices in other namespaces. The payload carries the peer node MAC (HSR_A_NODE_ADDR) and the slave port ifindex (HSR_A_IFINDEX). Switch both callers to genlmsg_multicast_netns(). Other families with .netnsok = true already do this. Examples are gtp, ovpn, team, batman-adv, netdev-genl, ethtool and handshake. hsr_nl_ringerror() already has the slave port. It uses dev_net(port->dev). hsr_nl_nodedown() takes the namespace from the master port via hsr_port_get_hsr().

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-97419 since 09/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/24/2026).

Upgrading to version 6.12.111 or 6.18.53 eliminates this vulnerability. Applying the patch 25b69f281cebe051a8e4ab19950a939c27ead1bc/24b3f1a9982c176d05a523a4bb9314dca0db4488/a762fabd7ef9a6cc07258684138f9c3f078d0326 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.7
VulDB Meta Temp Score: 2.6

VulDB Base Score: 2.7
VulDB Temp Score: 2.6
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: Improper synchronization
CWE: CWE-662
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 6.12.111/6.18.53
Patch: 25b69f281cebe051a8e4ab19950a939c27ead1bc/24b3f1a9982c176d05a523a4bb9314dca0db4488/a762fabd7ef9a6cc07258684138f9c3f078d0326

Timelineinfo

09/24/2026 Advisory disclosed
09/24/2026 +0 days CVE reserved
09/24/2026 +0 days VulDB entry created
09/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-97419 (🔒)
GCVE (CVE): GCVE-0-2026-97419
GCVE (VulDB): GCVE-100-409584

Entryinfo

Created: 09/24/2026 19:28
Changes: 09/24/2026 19:28 (59)
Complete: 🔍
Cache ID: 216::103

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