FKIE_CVE-2026-89830

Vulnerability from fkie_nvd - Published: 2026-09-16 11:16 - Updated: 2026-09-16 11:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix valid block count leak on data block allocation failure In __allocate_data_block(), when allocating a new data block (dn->data_blkaddr == NULL_ADDR), inc_valid_block_count() is called first to increment total_valid_block_count and i_blocks. If the subsequent f2fs_allocate_data_block() fails, the function returns the error directly without rolling back the already-incremented block counts, causing a permanent leak. Fix this by calling dec_valid_block_count() to undo the increment before returning the error. The condition old_blkaddr == NULL_ADDR precisely identifies the case where inc_valid_block_count() was called.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2d50b6d47e5671ff6a25834c5906d443356191f0",
              "status": "affected",
              "version": "7d009e048d7cfcc21d400f2aba4c8bacbdebbd47",
              "versionType": "git"
            },
            {
              "lessThan": "dde99df5a9d3b0ca6ac0a86f98799685f7399432",
              "status": "affected",
              "version": "7d009e048d7cfcc21d400f2aba4c8bacbdebbd47",
              "versionType": "git"
            },
            {
              "lessThan": "931e1aa4d44c52ff8e0feb38420a8827c62e886b",
              "status": "affected",
              "version": "7d009e048d7cfcc21d400f2aba4c8bacbdebbd47",
              "versionType": "git"
            },
            {
              "lessThan": "0f9af07ecc1ab486038373db6ae0436c5d674b19",
              "status": "affected",
              "version": "7d009e048d7cfcc21d400f2aba4c8bacbdebbd47",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\u003edata_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."
    }
  ],
  "id": "CVE-2026-89830",
  "lastModified": "2026-09-16T11:16:49.753",
  "metrics": {},
  "published": "2026-09-16T11:16:49.753",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0f9af07ecc1ab486038373db6ae0436c5d674b19"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2d50b6d47e5671ff6a25834c5906d443356191f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/931e1aa4d44c52ff8e0feb38420a8827c62e886b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dde99df5a9d3b0ca6ac0a86f98799685f7399432"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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