CVE-2025-71268 (GCVE-0-2025-71268)
Vulnerability from cvelistv5 – Published: 2026-03-18 17:40 – Updated: 2026-10-19 18:25
VLAI
EPSS
VEX
Title
btrfs: fix reservation leak in some error paths when inserting inline extent
Summary
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix reservation leak in some error paths when inserting inline extent
If we fail to allocate a path or join a transaction, we return from
__cow_file_range_inline() without freeing the reserved qgroup data,
resulting in a leak. Fix this by ensuring we call btrfs_qgroup_free_data()
in such cases.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:06 UTC
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
94ed938aba557aa798acf496f09afb289b619fcd , < f7156512c8166d385f574b9ec030479aa7b1e8c9
(git)
Affected: 94ed938aba557aa798acf496f09afb289b619fcd , < 28b97fcbbf523779688e8de5fe55bf2dae3859f6 (git) Affected: 94ed938aba557aa798acf496f09afb289b619fcd , < f3ee1732851aec6fe6b2cec2ef1b32d4e71d9913 (git) Affected: 94ed938aba557aa798acf496f09afb289b619fcd , < 28768bd3abf9995a93f6e01bfce01c60622964dd (git) Affected: 94ed938aba557aa798acf496f09afb289b619fcd , < c1c050f92d8f6aac4e17f7f2230160794fceef0c (git) |
guessed | |
| Linux | Linux |
Affected:
4.4
Unaffected: 0 , < 4.4 (semver) Unaffected: 6.1.163 , ≤ 6.1.* (semver) Unaffected: 6.6.124 , ≤ 6.6.* (semver) Unaffected: 6.12.70 , ≤ 6.12.* (semver) Unaffected: 6.18.10 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed |
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"lessThan": "28768bd3abf9995a93f6e01bfce01c60622964dd",
"status": "affected",
"version": "94ed938aba557aa798acf496f09afb289b619fcd",
"versionType": "git"
},
{
"lessThan": "c1c050f92d8f6aac4e17f7f2230160794fceef0c",
"status": "affected",
"version": "94ed938aba557aa798acf496f09afb289b619fcd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/btrfs/inode.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.4"
},
{
"lessThan": "4.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.163",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.124",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.70",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.163",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.124",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.70",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.10",
"versionStartIncluding": "4.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19",
"versionStartIncluding": "4.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix reservation leak in some error paths when inserting inline extent\n\nIf we fail to allocate a path or join a transaction, we return from\n__cow_file_range_inline() without freeing the reserved qgroup data,\nresulting in a leak. Fix this by ensuring we call btrfs_qgroup_free_data()\nin such cases."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - A remote attacker can reach Btrfs writeback through a guest-writable ksmbd or anonymous NFS export backed by the affected filesystem, using write-through or flush operations to force inline extent insertion.\nAC:L - On a qgroup-enabled deployment, the attacker can prepare many small inline writes and create concurrent memory pressure to induce the vulnerable allocation or transaction-handle failure; no victim-controlled race is required.\nPR:N - A writable guest SMB share or anonymous NFS export requires no authenticated privileges or kernel capabilities.\nUI:N - The attacker directly submits the writes and flush requests without requiring victim action.\nS:U - The leak affects Btrfs qgroup accounting within the same kernel and filesystem security authority.\nC:N - The bug neither exposes data nor creates an out-of-bounds read, use-after-free, or other memory-disclosure primitive.\nI:N - The defect only fails to release an accounting reservation and does not corrupt memory or modify filesystem data.\nA:H - Leaked reservations remain charged to the subvolume and its ancestor qgroups after delalloc cleanup and inode eviction, potentially exhausting a shared limit and denying all further writes until quotas are reset or the filesystem is remounted."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:12:37.025Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f7156512c8166d385f574b9ec030479aa7b1e8c9"
},
{
"url": "https://git.kernel.org/stable/c/28b97fcbbf523779688e8de5fe55bf2dae3859f6"
},
{
"url": "https://git.kernel.org/stable/c/f3ee1732851aec6fe6b2cec2ef1b32d4e71d9913"
},
{
"url": "https://git.kernel.org/stable/c/28768bd3abf9995a93f6e01bfce01c60622964dd"
},
{
"url": "https://git.kernel.org/stable/c/c1c050f92d8f6aac4e17f7f2230160794fceef0c"
}
],
"title": "btrfs: fix reservation leak in some error paths when inserting inline extent",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-71268",
"datePublished": "2026-03-18T17:40:58.080Z",
"dateReserved": "2026-03-17T09:08:18.457Z",
"dateUpdated": "2026-10-19T18:25:25.013Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.