Linux Kernel Vulnerability in nilfs2 That Causes System Hang
CVE-2025-71237
What is CVE-2025-71237?
A vulnerability in the nilfs2 file system of the Linux kernel may lead to system hangs when the FITRIM command is executed with improperly sized inputs. If end_block is set to a value smaller than the acceptable range (typically below 4KiB), it can cause an underflow during block calculations. This miscalculation makes nblocks appear as a large positive integer due to its u64 type. Consequently, the block layer function __blkdev_issue_discard() takes an excessive amount of time to process the bio chain while holding the ns_segctor_sem lock, which prevents other processes from acquiring the lock and leads to system hang scenarios.
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Affected Version(s)
Linux 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 < 6457d3ee41a4c15082ac49c5aa7fb933b4a043f3
Linux 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44
Linux 82e11e857be3ffd2a0a952c9db8aa2379e2b9e44 < 2438982f635e6cc2009be68ba2efb2998727d8d4