{"id":"CVE-2026-89830","title":"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_val…","summary":"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_val…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 < 2d50b6d47e5671ff6a25834c5906d443356191f0","Linux >= 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 < dde99df5a9d3b0ca6ac0a86f98799685f7399432","Linux >= 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 < 931e1aa4d44c52ff8e0feb38420a8827c62e886b","Linux >= 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 < 0f9af07ecc1ab486038373db6ae0436c5d674b19","Linux 6.9"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T11:16:49.753","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89830","references":[{"url":"https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.000Z","epss":0.002,"epssPercentile":0.10122,"slug":"CVE-2026-89830","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}