Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0 SMBUS Message I2C_SMBUS_BLOCK_MAX memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0. Affected by this vulnerability is the function I2C_SMBUS_BLOCK_MAX of the component SMBUS Message Handler. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2026-31627. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.82/6.18.23/6.19.13/7.0.0. It has been classified as critical. This affects the function I2C_SMBUS_BLOCK_MAX of the component SMBUS Message Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. 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: i2c: s3c24xx: check the size of the SMBUS message before using it The first byte of an i2c SMBUS message is the size, and it should be verified to ensure that it is in the range of 0..I2C_SMBUS_BLOCK_MAX before processing it. This is the same logic that was added in commit a6e04f05ce0b ("i2c: tegra: check msg length in SMBUS block read") to the i2c tegra driver.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31627 since 03/09/2026. The exploitability is told to be easy. 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 06/04/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310331 (Linux Distros Unpatched Vulnerability : CVE-2026-31627), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.83, 6.18.24, 6.19.14 or 7.0.1 eliminates this vulnerability. Applying the patch d87d5620125a03b1eadbd5df39748215d3db7ddb/377fae22a137b6b89f3f32399a58c52cf2325416/71b3c316b22c555d2769126a92b1244b15a9750d/aaaaec39ddbcd06770dca7f1adebc3b1242ebe7b 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 databases at Tenable (310331), EUVD (EUVD-2026-25520) and CERT Bund (WID-SEC-2026-1279). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Oracle Linux
  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

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

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: 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: 310331
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31627

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.83/6.18.24/6.19.14/7.0.1
Patch: d87d5620125a03b1eadbd5df39748215d3db7ddb/377fae22a137b6b89f3f32399a58c52cf2325416/71b3c316b22c555d2769126a92b1244b15a9750d/aaaaec39ddbcd06770dca7f1adebc3b1242ebe7b

Timelineinfo

03/09/2026 CVE reserved
04/24/2026 +45 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
06/04/2026 +41 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31627 (🔒)
GCVE (CVE): GCVE-0-2026-31627
GCVE (VulDB): GCVE-100-359403
EUVD: 🔒
CERT Bund: WID-SEC-2026-1279 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/24/2026 17:57
Updated: 06/04/2026 04:04
Changes: 04/24/2026 17:57 (59), 04/26/2026 01:01 (1), 04/26/2026 06:03 (2), 05/26/2026 10:03 (7), 06/04/2026 04:04 (11)
Complete: 🔍
Cache ID: 216::103

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

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