FKIE_CVE-2026-89576

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-10-19 09:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-era: fix shadowed superblock leak on take-snap failure metadata_take_snap() bumps the live superblock refcount and then dm_tm_shadow_block() allocates a new block for the metadata snapshot. If the subsequent dm_sm_inc_block() of writeset_tree_root or era_array_root fails, the function only unlocks the clone and returns. The newly allocated shadow block is never returned to the metadata space map, so each failed take-snap permanently leaks one metadata block. Free the clone with dm_sm_dec_block() on those error paths, matching the final step of metadata_drop_snap().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54dd21ca945ecc07885012b9f3e8197f091cfba0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc731d7fddfd6149f5e88ea080475d18c36d3c64
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9fa68b89214bc65af0ef963af7ec3cce9f866e0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef00efb6fcaee88f50891279ceced17c614e97f7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-era-target.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "54dd21ca945ecc07885012b9f3e8197f091cfba0",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "ef00efb6fcaee88f50891279ceced17c614e97f7",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "e9fa68b89214bc65af0ef963af7ec3cce9f866e0",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "dc731d7fddfd6149f5e88ea080475d18c36d3c64",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "d66ceeefb87ddb097b0546bafc581380b816b048",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "36ff918637e3517f732188a3c39dbeae5b9cfb1b",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "6876ca330e741fb8886d12070cb6a7f9cb67257e",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            },
            {
              "lessThan": "39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713",
              "status": "affected",
              "version": "eec40579d84873dfb7021eb24c50360f073237c5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-era-target.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.15"
            },
            {
              "lessThan": "3.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\ndm-era: fix shadowed superblock leak on take-snap failure\n\nmetadata_take_snap() bumps the live superblock refcount and then\ndm_tm_shadow_block() allocates a new block for the metadata snapshot.\nIf the subsequent dm_sm_inc_block() of writeset_tree_root or\nera_array_root fails, the function only unlocks the clone and\nreturns.  The newly allocated shadow block is never returned to the\nmetadata space map, so each failed take-snap permanently leaks one\nmetadata block.\n\nFree the clone with dm_sm_dec_block() on those error paths, matching\nthe final step of metadata_drop_snap()."
    }
  ],
  "id": "CVE-2026-89576",
  "lastModified": "2026-10-19T09:17:53.620",
  "metrics": {},
  "published": "2026-09-11T20:19:41.770",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54dd21ca945ecc07885012b9f3e8197f091cfba0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc731d7fddfd6149f5e88ea080475d18c36d3c64"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9fa68b89214bc65af0ef963af7ec3cce9f866e0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef00efb6fcaee88f50891279ceced17c614e97f7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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