CVE-2026-45955
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel related to the llbitmap_suspend_timeout() function. When a timeout occurs, this function fails to resurrect the percpu_ref, leading to its permanent blocking.
Risk Assessment
Organizations may face availability and stability issues as blocked control structures can prevent further operations on pages.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability and ensure proper memory management functionality.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: md/md-llbitmap: fix percpu_ref not resurrected on suspend timeout When llbitmap_suspend_timeout() times out waiting for percpu_ref to become zero, it returns -ETIMEDOUT without resurrecting the percpu_ref. The caller (md_llbitmap_daemon_fn) then continues to the next page without calling llbitmap_resume(), leaving the percpu_ref in a killed state permanently. Fix this by resurrecting the percpu_ref before returning the error, ensuring the page control structure remains usable for subsequent operations.