CVE-2023-54087
Unknown Unknown - Not Provided
Null Pointer Dereference in Linux Kernel UBI Volume Management

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ubi: Fix possible null-ptr-deref in ubi_free_volume() It willl cause null-ptr-deref in the following case: uif_init() ubi_add_volume() cdev_add() -> if it fails, call kill_volumes() device_register() kill_volumes() -> if ubi_add_volume() fails call this function ubi_free_volume() cdev_del() device_unregister() -> trying to delete a not added device, it causes null-ptr-deref So in ubi_free_volume(), it delete devices whether they are added or not, it will causes null-ptr-deref. Handle the error case whlie calling ubi_add_volume() to fix this problem. If add volume fails, set the corresponding vol to null, so it can not be accessed in kill_volumes() and release the resource in ubi_add_volume() error path.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-05-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-05-05
NVD
CVE-2023-54087
EUVD
EUVD-2023-60358
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel *
linux kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a null pointer dereference in the Linux kernel's ubi_free_volume() function. It occurs when ubi_add_volume() fails during device registration, leading to kill_volumes() calling ubi_free_volume(), which attempts to delete devices that were never successfully added. This causes a null pointer dereference because ubi_free_volume() does not check if the device was added before trying to delete it. The fix involves handling the error case in ubi_add_volume() by setting the corresponding volume to null if adding the volume fails, preventing access to invalid volumes during cleanup.


How can this vulnerability impact me? :

This vulnerability can cause a null pointer dereference in the Linux kernel, which may lead to a kernel crash or system instability. Such crashes can result in denial of service, affecting the availability of the system or device using the affected Linux kernel.


What immediate steps should I take to mitigate this vulnerability?

To mitigate this vulnerability, update the Linux kernel to a version where the ubi_free_volume() function properly handles error cases in ubi_add_volume(), ensuring that volumes are set to null if adding fails. This prevents null pointer dereferences by avoiding attempts to delete devices that were not successfully added.


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