CVE-2022-49951: firmware_loader: Fix use-after-free during unregister

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-18 · updated 2026-06-17
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: firmware_loader: Fix use-after-free during unregister In the following code within firmware_upload_unregister(), the call to device_unregister() could result in the dev_release function freeing the fw_upload_priv structure before it is dereferenced for the call to module_put(). This bug was found by the kernel test robot using CONFIG_KASAN while running the firmware selftests. device_unregister(&fw_sysfs->dev); module_put(fw_upload_priv->module); The problem is fixed by copying fw_upload_priv->module to a local variable for use when calling device_unregister().

Affected products

Linux kernel: from 5.19 before 5.19.8; 6.0-rc1, 6.0-rc2, 6.0-rc3 — fixed in 5.19.8

How to fix

Upgrade to a fixed version: Linux kernel 5.19.8. Check the vendor advisory for mitigations.

References

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