FKIE_CVE-2026-89576
Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19
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
Impacted products
| Vendor | Product | Version |
|---|
{
"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-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\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": "2026-09-14T13:19:12.180",
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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