Linux Kernel up to 6.19.8 mctp netif_rx memory leak

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.166/6.6.129/6.12.77/6.18.18/6.19.8. It has been classified as critical. The affected element is the function netif_rx of the component mctp. This manipulation causes memory leak. The identification of this vulnerability is CVE-2026-43457. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.1.166/6.6.129/6.12.77/6.18.18/6.19.8. Affected by this vulnerability is the function netif_rx of the component mctp. The manipulation with an unknown input leads to a memory leak vulnerability. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mctp: i2c: fix skb memory leak in receive path When 'midev->allow_rx' is false, the newly allocated skb isn't consumed by netif_rx(), it needs to free the skb directly.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-43457 since 05/01/2026. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 329305 (openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21388-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.167, 6.6.130, 6.12.78, 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 0fb2adbdd5c03e8c9ebcdc48afd414b2724c85eb/d7900a43b0a314a645ca0a2adf45928dbc7001f4/9f81be2ab9d8e4744871bfb3e868ef413413829f/1ec54187e1aa40a4cfa2b265e9a311179f24b98d/1b1be322342a6b0085bf6ee52235e5ac9834ec25/e3f5e0f22cfc2371e7471c9fd5b4da78f9df7c69 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (329305). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 329305
Nessus Name: openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21388-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.167/6.6.130/6.12.78/6.18.19/6.19.9
Patch: 0fb2adbdd5c03e8c9ebcdc48afd414b2724c85eb/d7900a43b0a314a645ca0a2adf45928dbc7001f4/9f81be2ab9d8e4744871bfb3e868ef413413829f/1ec54187e1aa40a4cfa2b265e9a311179f24b98d/1b1be322342a6b0085bf6ee52235e5ac9834ec25/e3f5e0f22cfc2371e7471c9fd5b4da78f9df7c69

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
07/25/2026 +78 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43457 (🔒)
GCVE (CVE): GCVE-0-2026-43457
GCVE (VulDB): GCVE-100-362269

Entryinfo

Created: 05/08/2026 18:38
Updated: 07/25/2026 12:27
Changes: 05/08/2026 18:38 (59), 05/22/2026 07:56 (10), 07/25/2026 12:27 (4)
Complete: 🔍
Cache ID: 216::103

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