FKIE_CVE-2026-46194

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-06-17 10:53
Severity
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix node_cnt race between extent node destroy and writeback f2fs_destroy_extent_node() does not set FI_NO_EXTENT before clearing extent nodes. When called from f2fs_drop_inode() with I_SYNC set, concurrent kworker writeback can insert new extent nodes into the same extent tree, racing with the destroy and triggering f2fs_bug_on() in __destroy_extent_node(). The scenario is as follows: drop inode writeback - iput - f2fs_drop_inode // I_SYNC set - f2fs_destroy_extent_node - __destroy_extent_node - while (node_cnt) { write_lock(&et->lock) __free_extent_tree write_unlock(&et->lock) - __writeback_single_inode - f2fs_outplace_write_data - f2fs_update_read_extent_cache - __update_extent_tree_range // FI_NO_EXTENT not set, // insert new extent node } // node_cnt == 0, exit while - f2fs_bug_on(node_cnt) // node_cnt > 0 Additionally, __update_extent_tree_range() only checks FI_NO_EXTENT for EX_READ type, leaving EX_BLOCK_AGE updates completely unprotected. This patch set FI_NO_EXTENT under et->lock in __destroy_extent_node(), consistent with other callers (__update_extent_tree_range and __drop_extent_tree) and check FI_NO_EXTENT for both EX_READ and EX_BLOCK_AGE tree.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0559a0e962aacbb47519e26ee663be04b72dcb92Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42dd1c91f993431d0b399502479d00e6ad1bca71Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab1eaf9d5c99042f5b0243bf67a06283a4c0757fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0e4395870eb3441ddc959f6710b5f6ca61aff26Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed78aeebef05212ef7dca93bd931e4eff67c113fPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "42dd1c91f993431d0b399502479d00e6ad1bca71",
              "status": "affected",
              "version": "295b50e95e900da31ff237e46e04525fa799b2cf",
              "versionType": "git"
            },
            {
              "lessThan": "ab1eaf9d5c99042f5b0243bf67a06283a4c0757f",
              "status": "affected",
              "version": "924f7dd1e832e4e4530d14711db223d2803f7b61",
              "versionType": "git"
            },
            {
              "lessThan": "b0e4395870eb3441ddc959f6710b5f6ca61aff26",
              "status": "affected",
              "version": "3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343",
              "versionType": "git"
            },
            {
              "lessThan": "0559a0e962aacbb47519e26ee663be04b72dcb92",
              "status": "affected",
              "version": "3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343",
              "versionType": "git"
            },
            {
              "lessThan": "ed78aeebef05212ef7dca93bd931e4eff67c113f",
              "status": "affected",
              "version": "3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.140",
              "status": "affected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.88",
              "status": "affected",
              "version": "6.12.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D4CBDA1A-C1EF-4EE5-9B1F-78E5ED0E4C0F",
              "versionEndExcluding": "6.6.140",
              "versionStartIncluding": "6.6.66",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F2C6E611-626C-4172-A00D-2E12CF6E8D5E",
              "versionEndExcluding": "6.12.88",
              "versionStartIncluding": "6.12.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B",
              "versionEndExcluding": "6.18.30",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E",
              "versionEndExcluding": "7.0.7",
              "versionStartIncluding": "6.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix node_cnt race between extent node destroy and writeback\n\nf2fs_destroy_extent_node() does not set FI_NO_EXTENT before clearing\nextent nodes. When called from f2fs_drop_inode() with I_SYNC set,\nconcurrent kworker writeback can insert new extent nodes into the same\nextent tree, racing with the destroy and triggering f2fs_bug_on() in\n__destroy_extent_node(). The scenario is as follows:\n\ndrop inode                            writeback\n - iput\n  - f2fs_drop_inode  // I_SYNC set\n   - f2fs_destroy_extent_node\n    - __destroy_extent_node\n     - while (node_cnt) {\n        write_lock(\u0026et-\u003elock)\n        __free_extent_tree\n        write_unlock(\u0026et-\u003elock)\n                                       - __writeback_single_inode\n                                        - f2fs_outplace_write_data\n                                         - f2fs_update_read_extent_cache\n                                          - __update_extent_tree_range\n                                           // FI_NO_EXTENT not set,\n                                           // insert new extent node\n       } // node_cnt == 0, exit while\n     - f2fs_bug_on(node_cnt)  // node_cnt \u003e 0\n\nAdditionally, __update_extent_tree_range() only checks FI_NO_EXTENT for\nEX_READ type, leaving EX_BLOCK_AGE updates completely unprotected.\n\nThis patch set FI_NO_EXTENT under et-\u003elock in __destroy_extent_node(),\nconsistent with other callers (__update_extent_tree_range and\n__drop_extent_tree) and check FI_NO_EXTENT for both EX_READ and\nEX_BLOCK_AGE tree."
    }
  ],
  "id": "CVE-2026-46194",
  "lastModified": "2026-06-17T10:53:15.237",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-28T10:16:35.033",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0559a0e962aacbb47519e26ee663be04b72dcb92"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/42dd1c91f993431d0b399502479d00e6ad1bca71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ab1eaf9d5c99042f5b0243bf67a06283a4c0757f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b0e4395870eb3441ddc959f6710b5f6ca61aff26"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/ed78aeebef05212ef7dca93bd931e4eff67c113f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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