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CVE-2025-71237 is an integer-underflow flaw in the Linux kernel nilfs2 filesystem's FITRIM discard-range handling. When calculating the number of blocks to discard, a sufficiently small ending block can cause the calculation to underflow. The result is stored in the unsigned 64-bit sector_t type, converting a negative value into an extremely large positive block count. The resulting oversized discard request can cause prolonged processing in the block layer while nilfs2 retains the ns_segctor_sem lock. The fix detects the invalid small range, performs no trimming, and reports a discarded length of zero.
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No public exploit code observed for this vulnerability.
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3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
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Cross-references every affected SKU, including bundled OEM variants.
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