{"id":"CVE-2026-89830","state":"PUBLISHED","title":"f2fs: fix valid block count leak on data block allocation failure","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.","publishedAt":"2026-09-16T10:31:02.688Z","updatedAt":"2026-10-19T08:53:23.860Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"2d50b6d47e5671ff6a25834c5906d443356191f0","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"dde99df5a9d3b0ca6ac0a86f98799685f7399432","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"931e1aa4d44c52ff8e0feb38420a8827c62e886b","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"0f9af07ecc1ab486038373db6ae0436c5d674b19","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/data.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/data.c"]}],"references":["https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0","https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432","https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b","https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89830.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89830","state":"PUBLISHED","datePublished":"2026-09-16T10:31:02.688Z","dateUpdated":"2026-10-19T08:53:23.860Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.769Z"},"containers":{"cna":{"title":"f2fs: fix valid block count leak on data block allocation failure","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"2d50b6d47e5671ff6a25834c5906d443356191f0","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"dde99df5a9d3b0ca6ac0a86f98799685f7399432","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"931e1aa4d44c52ff8e0feb38420a8827c62e886b","versionType":"git"},{"version":"7d009e048d7cfcc21d400f2aba4c8bacbdebbd47","status":"affected","lessThan":"0f9af07ecc1ab486038373db6ae0436c5d674b19","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/data.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/data.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0"},{"url":"https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432"},{"url":"https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b"},{"url":"https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:53:23.860Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}