{"id":"CVE-2026-89830","published":"2026-09-16T11:16:49.753","lastModified":"2026-09-16T11:16:49.753","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix valid block count leak on data block allocation failure\n\nIn __allocate_data_block(), when allocating a new data block\n(dn->data_blkaddr == NULL_ADDR), inc_valid_block_count() is\ncalled first to increment total_valid_block_count and i_blocks.\nIf the subsequent f2fs_allocate_data_block() fails, the function\nreturns the error directly without rolling back the\nalready-incremented block counts, causing a permanent leak.\n\nFix this by calling dec_valid_block_count() to undo the\nincrement before returning the error. The condition\nold_blkaddr == NULL_ADDR precisely identifies the case where\ninc_valid_block_count() was called.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19","tags":[]},{"url":"https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0","tags":[]},{"url":"https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b","tags":[]},{"url":"https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}