Linux Kernel FS Freeze bug: incorrect reverse check causes unintended freeze
CVE-2025-71106 Published on January 14, 2026
fs: PM: Fix reverse check in filesystems_freeze_callback()
In the Linux kernel, the following vulnerability has been resolved:
fs: PM: Fix reverse check in filesystems_freeze_callback()
The freeze_all_ptr check in filesystems_freeze_callback() introduced by
commit a3f8f8662771 ("power: always freeze efivarfs") is reverse which
quite confusingly causes all file systems to be frozen when
filesystem_freeze_enabled is false.
On my systems it causes the WARN_ON_ONCE() in __set_task_frozen() to
trigger, most likely due to an attempt to freeze a file system that is
not ready for that.
Add a logical negation to the check in question to reverse it as
appropriate.
Products Associated with CVE-2025-71106
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Affected Versions
Linux:- Version a3f8f8662771285511ae26c4c8d3ba1cd22159b9 and below b107196729ff6b9d6cde0a71f49c1243def43328 is affected.
- Version a3f8f8662771285511ae26c4c8d3ba1cd22159b9 and below 222047f68e8565c558728f792f6fef152a1d4d51 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.3, <= 6.18.* is unaffected.
- Version 6.19, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.