CVE-2026-68440
Received Received - Intake

txgbe Heap Overflow in Linux Kernel EEPROM Read

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: txgbe: fix heap overflow when reading module EEPROM txgbe_read_eeprom_hostif() always copies round_up(length, 4) bytes into the caller buffer, which ethtool allocates with exactly 'length' bytes. A non-4-aligned length therefore causes an out-of-bounds write. Copy only the remaining bytes on the final dword instead.

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Meta Information

Published
2026-08-12
Last Modified
2026-08-12
Generated
2026-08-12
AI Q&A
2026-08-12
EPSS Evaluated
N/A
NVD
CVE-2026-68440
EUVD
EUVD-2026-57048

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel txgbe *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a heap overflow issue in the Linux kernel's txgbe network driver. The function txgbe_read_eeprom_hostif() copies more data than allocated by ethtool when reading module EEPROM. Specifically, it copies round_up(length, 4) bytes into a buffer of size 'length', causing an out-of-bounds write if 'length' is not a multiple of 4.

Detection Guidance

This vulnerability is specific to the txgbe network driver in the Linux kernel. Detection requires checking if the txgbe module is loaded and inspecting kernel logs for related errors. Commands like 'lsmod | grep txgbe' can verify module presence, while 'dmesg | grep txgbe' may show heap overflow warnings.

Impact Analysis

This vulnerability could allow an attacker to corrupt kernel memory, potentially leading to system crashes, privilege escalation, or arbitrary code execution. It affects systems using the txgbe network driver, which may be common in servers or networking devices.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-68440. If using a distribution kernel, apply vendor-provided updates. Avoid using the txgbe driver until patched, or disable it if not required.

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