CVE-2026-74369
Received Received - Intake

Use-After-Free in Linux Kernel Liveupdate

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: liveupdate: fix u-a-f in luo_file_unpreserve_files() and luo_file_finish() In luo_file_unpreserve_files() and luo_file_finish(), reorder module_put() and xa_erase() to ensure the file handler module remains pinned while its operations are being accessed. Specifically, luo_get_id() dereferences fh->ops->get_id, so the module reference must be held until after xa_erase() (which calls luo_get_id) completes. For luo_file_finish(), this requires moving the module_put() call out of the luo_file_finish_one() helper and into the main loop of luo_file_finish() itself.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74369
EUVD
EUVD-2026-59516

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 a use-after-free (UAF) issue in the liveupdate subsystem. It occurs in two functions, luo_file_unpreserve_files() and luo_file_finish(), where module_put() and xa_erase() are incorrectly ordered. This can lead to a module being freed while its operations are still being accessed, causing a crash or potential code execution.

Detection Guidance

This vulnerability is specific to the Linux kernel and relates to a use-after-free issue in the liveupdate subsystem. Detection requires checking kernel logs for related errors or kernel crashes. Commands like dmesg | grep -i liveupdate or journalctl -k | grep -i liveupdate may help identify issues. Ensure your kernel is updated to a patched version.

Impact Analysis

If exploited, this vulnerability could cause system instability, crashes, or arbitrary code execution. Attackers might leverage it to gain elevated privileges or disrupt services running on affected Linux systems.

Mitigation Strategies

Immediately update your Linux kernel to the latest stable version that includes the fix for this vulnerability. Monitor kernel logs for any signs of exploitation or crashes. If you cannot update immediately, consider disabling the liveupdate feature if it is not critical to your operations.

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