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CVE-2025-71237 is a denial-of-service vulnerability in the Linux kernel's nilfs2 filesystem trim/discard handling. When processing a FITRIM request, nilfs2 can underflow while calculating the number of blocks to discard (nblocks) if the supplied ending block is too small. Because nblocks is a sector_t/u64 value, the negative result wraps to a very large positive integer. This can cause the block layer path, including __blkdev_issue_discard(), to spend an excessive amount of time processing the resulting bio chain while the ns_segctor_sem lock remains held. The prolonged lock hold blocks other nilfs2 tasks needing that semaphore and can hang the system. The fix changes handling of too-small ranges to a safe no-op that reports zero discarded length rather than attempting trimming.
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Cross-references every affected SKU, including bundled OEM variants.
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