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7.1
HIGH CVSS 3.1
CVE-2026-68293
net/mlx5: Fix MCIA register buffer overflow on 32 dword reads
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads The MCIA register can return up to 32 dwords (128 bytes) when the device advertises the mcia_32dwords capability, but struct mlx5_ifc_mcia_reg_bits only defines dword_0..11, leaving room for just 12 dwords (48 bytes) of data. mlx5_query_mcia() clamps the read size to mlx5_mcia_max_bytes() and then memcpy()s that many bytes out of the register, potentially reading past the end of the 'out' buffer. On kernels built with FORTIFY_SOURCE this is caught as a buffer overflow while reading the module EEPROM via ethtool: detected buffer overflow in memcpy kernel BUG at lib/string_helpers.c:1048! RIP: 0010:fortify_panic+0x13/0x20 Call Trace: mlx5_query_mcia.isra.0+0x200/0x210 [mlx5_core] mlx5_query_module_eeprom_by_page+0x4a/0xa0 [mlx5_core] mlx5e_get_module_eeprom_by_page+0xbb/0x120 [mlx5_core] eeprom_prepare_data+0xf3/0x170 ethnl_default_doit+0xf1/0x3b0 Extend the mcia_reg layout to 32 dwords.

Details
INFO

Published Date :

Aug. 10, 2026, 1:20 p.m.

Last Modified :

Aug. 17, 2026, 5:18 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-68293 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Fix buffer overflow in MCIA register reads by extending the layout.
  • Extend the MCIA register layout to 32 dwords.
  • Ensure the read size does not exceed the buffer capacity.
  • Update the mlx5_ifc_mcia_reg_bits structure.
  • Apply the provided kernel patch.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-68293.

URL Resource
https://git.kernel.org/stable/c/11c057d23465c7a5817a7284c896d19d54c0b616
https://git.kernel.org/stable/c/5be4eebd5a3a198dab0adcd550e1cadca79bdfed
https://git.kernel.org/stable/c/87b39a8c875ca744b7de69af0a8ef8874cffccf1
https://git.kernel.org/stable/c/88b2a16ddac3357e3f1d528e758b51e2c945d546
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-68293 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-68293 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-68293 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-68293 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '5be4eebd5a3a198dab0adcd550e1cadca79bdfed', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '87b39a8c875ca744b7de69af0a8ef8874cffccf1', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '88b2a16ddac3357e3f1d528e758b51e2c945d546', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '11c057d23465c7a5817a7284c896d19d54c0b616', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '5be4eebd5a3a198dab0adcd550e1cadca79bdfed', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '87b39a8c875ca744b7de69af0a8ef8874cffccf1', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '88b2a16ddac3357e3f1d528e758b51e2c945d546', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '11c057d23465c7a5817a7284c896d19d54c0b616', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'affected'}]
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 13, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 10, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '5be4eebd5a3a198dab0adcd550e1cadca79bdfed', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '87b39a8c875ca744b7de69af0a8ef8874cffccf1', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '88b2a16ddac3357e3f1d528e758b51e2c945d546', 'versionType': 'git'}, {'status': 'affected', 'version': '271907ee2f29cd1078fd219f0778fd824fb1971c', 'lessThan': '11c057d23465c7a5817a7284c896d19d54c0b616', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/mellanox/mlx5/core/port.c', 'include/linux/mlx5/mlx5_ifc.h'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads The MCIA register can return up to 32 dwords (128 bytes) when the device advertises the mcia_32dwords capability, but struct mlx5_ifc_mcia_reg_bits only defines dword_0..11, leaving room for just 12 dwords (48 bytes) of data. mlx5_query_mcia() clamps the read size to mlx5_mcia_max_bytes() and then memcpy()s that many bytes out of the register, potentially reading past the end of the 'out' buffer. On kernels built with FORTIFY_SOURCE this is caught as a buffer overflow while reading the module EEPROM via ethtool: detected buffer overflow in memcpy kernel BUG at lib/string_helpers.c:1048! RIP: 0010:fortify_panic+0x13/0x20 Call Trace: mlx5_query_mcia.isra.0+0x200/0x210 [mlx5_core] mlx5_query_module_eeprom_by_page+0x4a/0xa0 [mlx5_core] mlx5e_get_module_eeprom_by_page+0xbb/0x120 [mlx5_core] eeprom_prepare_data+0xf3/0x170 ethnl_default_doit+0xf1/0x3b0 Extend the mcia_reg layout to 32 dwords.
    Added Reference https://git.kernel.org/stable/c/11c057d23465c7a5817a7284c896d19d54c0b616
    Added Reference https://git.kernel.org/stable/c/5be4eebd5a3a198dab0adcd550e1cadca79bdfed
    Added Reference https://git.kernel.org/stable/c/87b39a8c875ca744b7de69af0a8ef8874cffccf1
    Added Reference https://git.kernel.org/stable/c/88b2a16ddac3357e3f1d528e758b51e2c945d546
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.1
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