Linux Kernel up to 6.18.52 cpsw_new cpsw_probe denial of service

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k1.62-

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.18.52. Affected is the function cpsw_probe of the component cpsw_new. Performing a manipulation results in denial of service. This vulnerability is identified as CVE-2026-98909. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.18.52. This affects the function cpsw_probe of the component cpsw_new. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: cpsw_new: unregister devlink on port registration failure cpsw_probe() registers devlink before registering the CPSW ports. If cpsw_register_ports() fails, the error path only unregisters the notifiers and then releases the lower level resources. It does not undo the successful cpsw_register_devlink() call, leaving the devlink instance and its parameters registered after probe has failed. Add a devlink cleanup label for the path where devlink registration has already succeeded, and use it when port registration fails.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98909 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/23/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111 or 6.18.53 eliminates this vulnerability. Applying the patch b020390b4ef39adc40c800301042baf812280da1/5a5ac0defdd42e566f1c871272370b6a3a8eef5c/43d4af5c5331ea739a49cb1097d41e502ed91ec4/8af61d5bd87fd1a3bdc81fe948e7acdc8aa5bcf0/2bcf21ede6b097ca96cb1f7679761acca6510555/0a44945b0d3422f5d81b49c97e293f3e21a8c585/b64f763b607426ac97e44b114f0b8844ac3b86dd is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-108865). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
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: Denial of service
CWE: 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 5.10.271/5.15.222/6.1.189/6.6.158/6.12.111/6.18.53
Patch: b020390b4ef39adc40c800301042baf812280da1/5a5ac0defdd42e566f1c871272370b6a3a8eef5c/43d4af5c5331ea739a49cb1097d41e502ed91ec4/8af61d5bd87fd1a3bdc81fe948e7acdc8aa5bcf0/2bcf21ede6b097ca96cb1f7679761acca6510555/0a44945b0d3422f5d81b49c97e293f3e21a8c585/b64f763b607426ac97e44b114f0b8844ac3b86dd

Timelineinfo

09/25/2026 CVE reserved
10/23/2026 +28 days Advisory disclosed
10/23/2026 +0 days VulDB entry created
10/23/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98909 (🔒)
GCVE (CVE): GCVE-0-2026-98909
GCVE (VulDB): GCVE-100-425721
EUVD: 🔒

Entryinfo

Created: 10/23/2026 14:48
Updated: 10/23/2026 15:45
Changes: 10/23/2026 14:48 (59), 10/23/2026 15:45 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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