CVE-2025-21817

block: mark GFP_NOIO around sysfs ->store()

Description

In the Linux kernel, the following vulnerability has been resolved: block: mark GFP_NOIO around sysfs ->store() sysfs ->store is called with queue freezed, meantime we have several ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate memory with GFP_KERNEL which may run into direct reclaim code path, then potential deadlock can be caused. Fix the issue by marking NOIO around sysfs ->store()

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31
https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c

Frequently Asked Questions

What is the severity of CVE-2025-21817?: CVE-2025-21817 has not yet been assigned a CVSS score.
How to fix CVE-2025-21817?: To fix CVE-2025-21817, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21817 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21817 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21817?: CVE-2025-21817 affects Linux Linux, Linux Linux.

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