CVE-2025-38660 (GCVE-0-2025-38660)
Vulnerability from cvelistv5 – Published: 2025-08-22 16:01 – Updated: 2026-09-14 11:58
VLAI
EPSS
VEX
Title
[ceph] parse_longname(): strrchr() expects NUL-terminated string
Summary
In the Linux kernel, the following vulnerability has been resolved:
[ceph] parse_longname(): strrchr() expects NUL-terminated string
... and parse_longname() is not guaranteed that. That's the reason
why it uses kmemdup_nul() to build the argument for kstrtou64();
the problem is, kstrtou64() is not the only thing that need it.
Just get a NUL-terminated copy of the entire thing and be done
with that...
Severity
9.8 (Critical)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
dd66df0053ef84add5e684df517aa9b498342381 , < 4b9aee707c4580511983a0998547f3b28514e6a6
(git)
Affected: dd66df0053ef84add5e684df517aa9b498342381 , < bb80f7618832d26f7e395f52f82b1dac76223e5f (git) Affected: dd66df0053ef84add5e684df517aa9b498342381 , < 3145b2b11492d61c512bbc59660bb823bc757f48 (git) Affected: dd66df0053ef84add5e684df517aa9b498342381 , < 493479af8af3ab907f49e99323777d498a4fbd2b (git) Affected: dd66df0053ef84add5e684df517aa9b498342381 , < 101841c38346f4ca41dc1802c867da990ffb32eb (git) |
guessed | |
| Linux | Linux |
Affected:
6.6
Unaffected: 0 , < 6.6 (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.42 , ≤ 6.12.* (semver) Unaffected: 6.15.10 , ≤ 6.15.* (semver) Unaffected: 6.16.1 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed |
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}
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},
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\n[ceph] parse_longname(): strrchr() expects NUL-terminated string\n\n... and parse_longname() is not guaranteed that. That\u0027s the reason\nwhy it uses kmemdup_nul() to build the argument for kstrtou64();\nthe problem is, kstrtou64() is not the only thing that need it.\n\nJust get a NUL-terminated copy of the entire thing and be done\nwith that..."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The unterminated string is dentry-name data read directly out of a Ceph MDS reply message (`info-\u003edname = *p`, `_name = *p`) sitting in the kvmalloc\u0027d `msg-\u003efront` buffer, so a malicious/compromised MDS or an on-path attacker on unencrypted cephfs traffic supplies it remotely. No local caller can produce a non-NUL-terminated name.\nAC:L - The attacker fully controls the reply contents and the exact `front_len`, so they can place the name flush against the end of the allocation and make the overread deterministic; the only build requirement is `CONFIG_FS_ENCRYPTION=y`, which is standard in distro and Android kernels, and no encryption key or encrypted directory is needed since `parse_longname()` runs before those checks.\nPR:N - The attacker holds no account or privilege on the victim client \u2014 the malicious reply is processed by the messenger/MDS-client code with no authorization check on the client side. Any process\u0027s routine directory access on the already-established mount suffices to consume it.\nUI:N - The snapdir condition depends on the server-supplied `snapid`, so a hostile MDS can mark an ordinary directory as `CEPH_SNAPDIR` and trigger the path on any normal readdir or lookup \u2014 no deliberate `.snap` access, remount, or other victim action is required.\nS:U - The out-of-bounds access is confined to kernel memory within the same security authority as the ceph client; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `strrchr()` reads unbounded adjacent kernel heap until it finds a NUL, and the resulting inflated `*name_len` causes those out-of-bounds bytes to be base64-decoded and propagated into the dentry name handed back toward userspace, giving an unbounded kernel memory disclosure primitive.\nI:H - The corrupted `*name_len` is no longer bounded by the `NAME_MAX` check (which was applied to the pre-parse copy), so `ceph_base64_decode()` and `fscrypt_fname_disk_to_usr()` write far past the end of the `NAME_MAX` fscrypt buffer or the message front buffer, yielding a heap out-of-bounds write with attacker-influenced data.\nA:H - The overread walks off a kvmalloc allocation and can hit a vmalloc guard page or unmapped memory, and the derived oversized length drives a heap overflow \u2014 either produces an oops/panic in the ceph messenger work context, and the attacker can repeat it on every reply."
}
]
}
],
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"dateUpdated": "2026-09-14T11:58:04.340Z",
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"shortName": "Linux"
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},
{
"url": "https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb"
}
],
"title": "[ceph] parse_longname(): strrchr() expects NUL-terminated string",
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"cveId": "CVE-2025-38660",
"datePublished": "2025-08-22T16:01:03.686Z",
"dateReserved": "2025-04-16T04:51:24.031Z",
"dateUpdated": "2026-09-14T11:58:04.340Z",
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"date": "2026-09-16",
"epss": "0.00389",
"percentile": "0.32638"
},
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"cve": "CVE-2025-38660",
"id": "msrc_CVE-2025-38660",
"initial_release_date": "2025-09-03T22:14:03.000Z",
"product_status:known_affected": "19",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "[ceph] parse_longname(): strrchr() expects NUL-terminated string",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38660.json",
"version": "18"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-38660\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:41.193\",\"lastModified\":\"2026-09-14T12:17:36.787\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\n[ceph] parse_longname(): strrchr() expects NUL-terminated string\\n\\n... and parse_longname() is not guaranteed that. That\u0027s the reason\\nwhy it uses kmemdup_nul() to build the argument for kstrtou64();\\nthe problem is, kstrtou64() is not the only thing that need it.\\n\\nJust get a NUL-terminated copy of the entire thing and be done\\nwith that...\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: [ceph] parse_longname(): strrchr() espera una cadena terminada en NUL... y parse_longname() no lo garantiza. Por eso usa kmemdup_nul() para construir el argumento de kstrtou64(); el problema es que kstrtou64() no es el \u00fanico que lo necesita. Simplemente obtenga una copia terminada en NUL de todo el conjunto y listo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ceph/crypto.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"dd66df0053ef84add5e684df517aa9b498342381\",\"lessThan\":\"4b9aee707c4580511983a0998547f3b28514e6a6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd66df0053ef84add5e684df517aa9b498342381\",\"lessThan\":\"bb80f7618832d26f7e395f52f82b1dac76223e5f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd66df0053ef84add5e684df517aa9b498342381\",\"lessThan\":\"3145b2b11492d61c512bbc59660bb823bc757f48\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd66df0053ef84add5e684df517aa9b498342381\",\"lessThan\":\"493479af8af3ab907f49e99323777d498a4fbd2b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd66df0053ef84add5e684df517aa9b498342381\",\"lessThan\":\"101841c38346f4ca41dc1802c867da990ffb32eb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ceph/crypto.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.42\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.10\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.1\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6\",\"versionEndExcluding\":\"6.12.42\",\"matchCriteriaId\":\"2081142E-1E36-42C9-9F17-D17DFF7B026B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.10\",\"matchCriteriaId\":\"5890C690-B295-40C2-9121-FF5F987E5142\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.16\",\"versionEndExcluding\":\"6.16.1\",\"matchCriteriaId\":\"58182352-D7DF-4CC9-841E-03C1D852C3FB\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3145b2b11492d61c512bbc59660bb823bc757f48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/493479af8af3ab907f49e99323777d498a4fbd2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T09:02:25+00:00",
"cve": "CVE-2025-38660",
"id": "CVE-2025-38660",
"initial_release_date": "2025-08-22T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: [ceph] parse_longname(): strrchr() expects NUL-terminated string",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38660.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:59:49Z",
"cve": "CVE-2025-38660",
"id": "CVE-2025-38660",
"initial_release_date": "2025-08-22T23:28:21Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "466",
"product_status:known_not_affected": "338",
"product_status:recommended": "472",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-38660",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38660.json",
"version": "54"
}
}
}
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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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