Use After Free in Linux
CVE-2022-49951
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().
Vulnerability class: Use-After-Free
EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions 97730bbb242cde22b7140acd202ffd88823886c9, 5.19, 0
- Linux Linux_kernel — versions 6.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2022-49951?
- CVE-2022-49951 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2025-06-18.
- How severe is CVE-2022-49951?
- High severity. CVSS v3 base score is 7.8 out of 10.