Linux Kernel up to 7.1-rc2 ipmi buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$5k-$25k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc2. It has been rated as critical. This issue affects some unknown processing of the component ipmi. This manipulation causes buffer overflow. This vulnerability is tracked as CVE-2026-46128. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc2. It has been declared as critical. Affected by this vulnerability is an unknown function of the component ipmi. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ipmi: Check event message buffer response for bad data The event message buffer response data size got checked later when processing, but check it right after the response comes back. It appears some BMCs may return an empty message instead of an error when fetching events. There are apparently some new BMCs that make this error, so we need to compensate.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-46128 since 05/13/2026. The exploitation appears to be easy. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 333469 (EulerOS 2.0 SP11 : kernel (EulerOS-SA-2026-3126)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.140, 6.12.88, 6.18.30, 7.0.7 or 7.1-rc3 eliminates this vulnerability. Applying the patch 2418e4b21fb1355504d095da5d5f0a210564a43d/7f7ada72c07a83b46045ddfeee526bd9e2e3c8f0/42432b579a594b66ac32e5e7b7c26e6bc578ec89/24269264c3d59a49eb09b10af2c75b14f2931482/36920f30e78e69df01f9691c470b6f3ba8aebf98 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 (333469). 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: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
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: 333469
Nessus Name: EulerOS 2.0 SP11 : kernel (EulerOS-SA-2026-3126)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.140/6.12.88/6.18.30/7.0.7/7.1-rc3
Patch: 2418e4b21fb1355504d095da5d5f0a210564a43d/7f7ada72c07a83b46045ddfeee526bd9e2e3c8f0/42432b579a594b66ac32e5e7b7c26e6bc578ec89/24269264c3d59a49eb09b10af2c75b14f2931482/36920f30e78e69df01f9691c470b6f3ba8aebf98

Timelineinfo

05/13/2026 CVE reserved
05/28/2026 +15 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
08/08/2026 +72 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-46128 (🔒)
GCVE (CVE): GCVE-0-2026-46128
GCVE (VulDB): GCVE-100-366667

Entryinfo

Created: 05/28/2026 13:34
Updated: 08/08/2026 11:57
Changes: 05/28/2026 13:34 (58), 06/25/2026 03:24 (11), 08/08/2026 11:57 (4)
Complete: 🔍
Cache ID: 216::103

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

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