CVE-2026-72164 (GCVE-0-2026-72164)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:41
VLAI
EPSS
VEX
Title
ocfs2: avoid moving extents to occupied clusters
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: avoid moving extents to occupied clusters
For non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical
me_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and
expects ocfs2_probe_alloc_group() to replace it with a free run in the
target block group.
The probe currently leaves *phys_cpos unchanged if the scan reaches the
end of the group without finding a free run. An occupied goal at the last
bit can therefore survive the probe and be passed to
__ocfs2_move_extent(), which copies file data into a cluster still owned
by another inode before the bitmap is updated.
When the probe does find a free run, it also subtracts move_len from the
ending bit. The start of an N-bit run ending at i is i - N + 1, so the
current calculation can report the bit immediately before the free run.
Clear *phys_cpos before scanning and use the correct free-run start.
Callers already treat a zero result as -ENOSPC, so failed probes no longer
continue with an occupied caller-controlled goal.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 3112afebf2a76e522fbaabcbb0c47aafbdc35932
(git)
Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 35486b291b8fbde6c4d0b1c79e565c6260d3329d (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 19f7b04924b20b81dabbeed19d5542792ba5b6d6 (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < e281d892ce5870a50fdc718cb3bfc3dd5b62c728 (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < d5d5a21fb33cd9b963aea99da81e4dacd452cd95 (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 4d1953d3aeb4a7f6623083e1839068ee1c157db2 (git) Affected: e6b5859cccfa0fec02f3c5b1069481efc7186f47 , < 22920541c35a9f23f219038ba5874c843a7c4419 (git) |
guessed | |
| Linux | Linux |
Affected:
3.0
Unaffected: 0 , < 3.0 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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"programFiles": [
"fs/ocfs2/move_extents.c"
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"version": "5.10.261",
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{
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"version": "5.15.212",
"versionType": "semver"
},
{
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"version": "6.1.178",
"versionType": "semver"
},
{
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"version": "6.12.97",
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{
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"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
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}
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: avoid moving extents to occupied clusters\n\nFor non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical\nme_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and\nexpects ocfs2_probe_alloc_group() to replace it with a free run in the\ntarget block group.\n\nThe probe currently leaves *phys_cpos unchanged if the scan reaches the\nend of the group without finding a free run. An occupied goal at the last\nbit can therefore survive the probe and be passed to\n__ocfs2_move_extent(), which copies file data into a cluster still owned\nby another inode before the bitmap is updated.\n\nWhen the probe does find a free run, it also subtracts move_len from the\nending bit. The start of an N-bit run ending at i is i - N + 1, so the\ncurrent calculation can report the bit immediately before the free run.\n\nClear *phys_cpos before scanning and use the correct free-run start. \nCallers already treat a zero result as -ENOSPC, so failed probes no longer\ncontinue with an occupied caller-controlled goal."
}
],
"metrics": [
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
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"lang": "en",
"value": "AV:L - Exploitation requires the OCFS2_IOC_MOVE_EXT ioctl on a locally mounted ocfs2 volume via sys_ioctl\u2192vfs_ioctl\u2192ocfs2_ioctl; OCFS2 has no network-facing handler exposing this code path.\nAC:L - The attacker fully controls me_goal and move length on the non-auto path; an occupied goal at the end of an alloc group deterministically bypasses ocfs2_probe_alloc_group() and reaches __ocfs2_move_extent() with no races or external preconditions.\nPR:L - OCFS2_IOC_MOVE_EXT performs no capable() check (unlike FITRIM); any local user with FMODE_WRITE on a regular file on an ocfs2 mount can invoke ioctl(), including root inside a user namespace per kernel CNA guidance.\nUI:N - The attacker issues OCFS2_IOC_MOVE_EXT on their own writable fd with crafted parameters; no victim interaction or third-party action is required beyond the enterprise ocfs2 mount already being present.\nS:U - Impact is confined to on-disk data corruption and filesystem availability within the same cluster node/kernel authority; it does not cross VM, container, or IOMMU security boundaries.\nC:H - __ocfs2_move_extent() copies into clusters still allocated to other inodes, creating cross-file block aliasing on shared cluster storage so later reads through the new extent can return another tenant\u0027s or root-owned file contents.\nI:H - ocfs2_duplicate_clusters_by_page() writes attacker-controlled file data into physical clusters owned by other inodes before the bitmap is updated, enabling arbitrary corruption of files the attacker lacks write permission to on shared OCFS2 storage.\nA:H - Dual allocation and bitmap/extent inconsistency can trigger ocfs2_error(), forcing remount-ro or panic on the node and corrupting shared storage in ways that impair availability for all cluster members until fsck.ocfs2."
}
]
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
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{
"url": "https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419"
}
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"title": "ocfs2: avoid moving extents to occupied clusters",
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"cveId": "CVE-2026-72164",
"datePublished": "2026-08-15T05:53:31.901Z",
"dateReserved": "2026-08-09T03:40:39.909Z",
"dateUpdated": "2026-08-17T05:41:06.039Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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"date": "2026-10-01",
"epss": "0.00176",
"percentile": "0.06394"
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{
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{
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{
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"versionType": "semver"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: avoid moving extents to occupied clusters\n\nFor non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical\nme_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and\nexpects ocfs2_probe_alloc_group() to replace it with a free run in the\ntarget block group.\n\nThe probe currently leaves *phys_cpos unchanged if the scan reaches the\nend of the group without finding a free run. An occupied goal at the last\nbit can therefore survive the probe and be passed to\n__ocfs2_move_extent(), which copies file data into a cluster still owned\nby another inode before the bitmap is updated.\n\nWhen the probe does find a free run, it also subtracts move_len from the\nending bit. The start of an N-bit run ending at i is i - N + 1, so the\ncurrent calculation can report the bit immediately before the free run.\n\nClear *phys_cpos before scanning and use the correct free-run start. \nCallers already treat a zero result as -ENOSPC, so failed probes no longer\ncontinue with an occupied caller-controlled goal."
}
],
"id": "CVE-2026-72164",
"lastModified": "2026-08-17T06:18:16.720",
"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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:21:34.357",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e"
},
{
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"url": "https://git.kernel.org/stable/c/19f7b04924b20b81dabbeed19d5542792ba5b6d6"
},
{
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"url": "https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419"
},
{
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"url": "https://git.kernel.org/stable/c/3112afebf2a76e522fbaabcbb0c47aafbdc35932"
},
{
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"url": "https://git.kernel.org/stable/c/35486b291b8fbde6c4d0b1c79e565c6260d3329d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4d1953d3aeb4a7f6623083e1839068ee1c157db2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d5d5a21fb33cd9b963aea99da81e4dacd452cd95"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e281d892ce5870a50fdc718cb3bfc3dd5b62c728"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-18T14:32:52+00:00",
"cve": "CVE-2026-72164",
"id": "CVE-2026-72164",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ocfs2: avoid moving extents to occupied clusters",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72164.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-23T00:19:14Z",
"cve": "CVE-2026-72164",
"id": "CVE-2026-72164",
"initial_release_date": "2026-08-31T13:29:46Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "619",
"product_status:known_not_affected": "41",
"product_status:recommended": "96",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72164",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72164.json",
"version": "6"
}
}
}
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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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