CVE-2026-74592
Received Received - Intake

IMA Hook Truncation Reset in Linux Kernel

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ima: Instantiate file_truncate and path_truncate hooks Instantiate the file_truncate and path_truncate LSM hooks to reset the action cache flags (IMA_DONE_MASK) as soon as truncation is requested, so the file, based on policy, is re-collected, re-measured, re-audited, and re-appraised on next access.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74592
EUVD
EUVD-2026-64529

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the IMA (Integrity Measurement Architecture) component. The issue is that the file_truncate and path_truncate LSM hooks were not properly instantiated, which could lead to stale integrity measurements or audits for files after truncation operations.

Detection Guidance

This vulnerability is specific to the Linux kernel's IMA (Integrity Measurement Architecture) subsystem. Detection requires checking kernel logs for IMA-related events or verifying if the file_truncate and path_truncate hooks are properly instantiated. Use commands like 'dmesg | grep IMA' or 'grep -i truncate /var/log/syslog' to inspect logs for IMA-related truncation events.

Impact Analysis

If exploited, this vulnerability could allow an attacker to bypass integrity checks on files after truncation, potentially leading to unauthorized modifications going undetected. This might result in data integrity issues or security breaches.

Mitigation Strategies

Update the Linux kernel to the latest patched version where this vulnerability is resolved. Monitor vendor advisories for kernel updates and apply them promptly. Ensure IMA policies are correctly configured to enforce re-measurement and re-appraisal after file truncation events.

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