What’s Vulnerable › Vulnerabilities

CVE-2025-21817: block: mark GFP_NOIO around sysfs ->store()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-27 · updated 2026-09-07
• Weakness: CWE-667

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()

Affected products

• Linux kernel: 6.13.2

References

• https://git.kernel.org/stable/c/2566ce907e5d5db8a039647208e029ce559baa31
• https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c
• https://git.kernel.org/stable/c/a09280c39ea54080daf19cfaf4a3121a8d17d5cd

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