Description

In the Linux kernel, the following vulnerability has been resolved:

xen: Fix the issue of resource not being properly released in xenbus_dev_probe()

This patch fixes an issue in the function xenbus_dev_probe(). In the
xenbus_dev_probe() function, within the if (err) branch at line 313, the
program incorrectly returns err directly without releasing the resources
allocated by err = drv->probe(dev, id). As the return value is non-zero,
the upper layers assume the processing logic has failed. However, the probe
operation was performed earlier without a corresponding remove operation.
Since the probe actually allocates resources, failing to perform the remove
operation could lead to problems.

To fix this issue, we followed the resource release logic of the
xenbus_dev_remove() function by adding a new block fail_remove before the
fail_put block. After entering the branch if (err) at line 313, the
function will use a goto statement to jump to the fail_remove block,
ensuring that the previously acquired resources are correctly released,
thus preventing the reference count leak.

This bug was identified by an experimental static analysis tool developed
by our team. The tool specializes in analyzing reference count operations
and detecting potential issues where resources are not properly managed.
In this case, the tool flagged the missing release operation as a
potential problem, which led to the development of this patch.

Classification

CVE ID: CVE-2024-53198

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 15.26% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/87106169b4ce26f85561f953d13d1fd86d99b612
https://git.kernel.org/stable/c/0aa9e30b5b4af5dd504801689d6d84c584290a45
https://git.kernel.org/stable/c/e8823e6ff313465910edea07581627d85e68d9fd
https://git.kernel.org/stable/c/3fc0996d2fefe61219375fd650601724b8cf2d30
https://git.kernel.org/stable/c/804b96f8d0a02fa10b92f28b2e042f9128ed3ffc
https://git.kernel.org/stable/c/217bdce88b104269b73603b84d0ab4dd04f481bc
https://git.kernel.org/stable/c/2f977a4c82d35d063f5fe198bbc501c4b1c5ea0e
https://git.kernel.org/stable/c/afc545da381ba0c651b2658966ac737032676f01

Timeline