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dm-era: fix shadowed superblock leak on take-snap failure

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-89576

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89576

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "54dd21ca945ecc07885012b9f3e8197f091cfba0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "ef00efb6fcaee88f50891279ceced17c614e97f7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "e9fa68b89214bc65af0ef963af7ec3cce9f866e0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "dc731d7fddfd6149f5e88ea080475d18c36d3c64",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "d66ceeefb87ddb097b0546bafc581380b816b048",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "36ff918637e3517f732188a3c39dbeae5b9cfb1b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "6876ca330e741fb8886d12070cb6a7f9cb67257e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "eec40579d84873dfb7021eb24c50360f073237c5",
        "lessThan": "39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/md/dm-era-target.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/md/dm-era-target.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89576

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#35085 · Revision 1
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Publisher date
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