FKIE_CVE-2025-21879

Vulnerability from fkie_nvd - Published: 2025-03-27 15:15 - Updated: 2026-06-17 08:44
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free on inode when scanning root during em shrinking At btrfs_scan_root() we are accessing the inode's root (and fs_info) in a call to btrfs_fs_closing() after we have scheduled the inode for a delayed iput, and that can result in a use-after-free on the inode in case the cleaner kthread does the iput before we dereference the inode in the call to btrfs_fs_closing(). Fix this by using the fs_info stored already in a local variable instead of doing inode->root->fs_info.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07836bc18f4ae42da4e922244f4685561c18755e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/59f37036bb7ab3d554c24abc856aabca01126414Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e79d26014f9386387575b9ed60d342057cee49bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14
linux linux_kernel 6.14
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/extent_map.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "07836bc18f4ae42da4e922244f4685561c18755e",
              "status": "affected",
              "version": "fef55c4d9c9c22264d2b2ceae1e26922cb6129a5",
              "versionType": "git"
            },
            {
              "lessThan": "5e79d26014f9386387575b9ed60d342057cee49b",
              "status": "affected",
              "version": "1020443840569535f6025a855958f07ea3eebf71",
              "versionType": "git"
            },
            {
              "lessThan": "59f37036bb7ab3d554c24abc856aabca01126414",
              "status": "affected",
              "version": "1020443840569535f6025a855958f07ea3eebf71",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/extent_map.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": "6.13.*",
              "status": "unaffected",
              "version": "6.13.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "64F12D9B-71C2-4CD7-A288-0D5EF1709620",
              "versionEndExcluding": "6.13.6",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "D3D6550E-6679-4560-902D-AF52DCFE905B",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free on inode when scanning root during em shrinking\n\nAt btrfs_scan_root() we are accessing the inode\u0027s root (and fs_info) in a\ncall to btrfs_fs_closing() after we have scheduled the inode for a delayed\niput, and that can result in a use-after-free on the inode in case the\ncleaner kthread does the iput before we dereference the inode in the call\nto btrfs_fs_closing().\n\nFix this by using the fs_info stored already in a local variable instead\nof doing inode-\u003eroot-\u003efs_info."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: se corrige el use-after-free en el inodo al escanear la ra\u00edz durante la reducci\u00f3n de em. En btrfs_scan_root(), accedemos a la ra\u00edz del inodo (y a fs_info) en una llamada a btrfs_fs_closing() despu\u00e9s de haber programado el inodo para una entrada retrasada, lo que puede resultar en un use-after-free en el inodo en caso de que el kthread m\u00e1s limpio realice la entrada antes de que desreferenciamos el inodo en la llamada a btrfs_fs_closing(). Se soluciona esto usando la fs_info ya almacenada en una variable local en lugar de hacer inode-\u0026gt;root-\u0026gt;fs_info."
    }
  ],
  "id": "CVE-2025-21879",
  "lastModified": "2026-06-17T08:44:31.037",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-21879",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-28T15:22:49.038837Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-03-27T15:15:55.790",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07836bc18f4ae42da4e922244f4685561c18755e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/59f37036bb7ab3d554c24abc856aabca01126414"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5e79d26014f9386387575b9ed60d342057cee49b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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