CVE-2025-38660

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That's 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": {"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"}, "scenarios": [{"lang": "en", "value": "AV:N - The unterminated string is dentry-name data read directly out of a Ceph MDS reply message (`info->dname = *p`, `_name = *p`) sitting in the kvmalloc'd `msg->front` 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's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/crypto.c"], "versions": [{"version": "dd66df0053ef84add5e684df517aa9b498342381", "lessThan": "4b9aee707c4580511983a0998547f3b28514e6a6", "status": "affected", "versionType": "git"}, {"version": "dd66df0053ef84add5e684df517aa9b498342381", "lessThan": "bb80f7618832d26f7e395f52f82b1dac76223e5f", "status": "affected", "versionType": "git"}, {"version": "dd66df0053ef84add5e684df517aa9b498342381", "lessThan": "3145b2b11492d61c512bbc59660bb823bc757f48", "status": "affected", "versionType": "git"}, {"version": "dd66df0053ef84add5e684df517aa9b498342381", "lessThan": "493479af8af3ab907f49e99323777d498a4fbd2b", "status": "affected", "versionType": "git"}, {"version": "dd66df0053ef84add5e684df517aa9b498342381", "lessThan": "101841c38346f4ca41dc1802c867da990ffb32eb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/crypto.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.42", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.10", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.1", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.15.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.16.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6"}, {"url": "https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f"}, {"url": "https://git.kernel.org/stable/c/3145b2b11492d61c512bbc59660bb823bc757f48"}, {"url": "https://git.kernel.org/stable/c/493479af8af3ab907f49e99323777d498a4fbd2b"}, {"url": "https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb"}], "title": "[ceph] parse_longname(): strrchr() expects NUL-terminated string", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38660", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:52:41.406590Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T22:02:27.813Z"}}]}}

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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's 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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["fs/ceph/crypto.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"status": "unaffected", "version": "0", "lessThan": "6.6", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.42", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.10", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16.1", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ceph/crypto.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6"}, {"url": "https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f"}, {"url": "https://git.kernel.org/stable/c/3145b2b11492d61c512bbc59660bb823bc757f48"}, {"url": "https://git.kernel.org/stable/c/493479af8af3ab907f49e99323777d498a4fbd2b"}, {"url": "https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb"}], "x_generator": {"engine": "bippy-1.2.0"}, "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's 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..."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.42", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15.10", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.1", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "6.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-14T11:58:04.340Z"}}}, "cveMetadata": {"cveId": "CVE-2025-38660", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:02:27.813Z", "dateReserved": "2025-04-16T04:51:24.031Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-08-22T16:01:03.686Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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That's 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."}], "id": "CVE-2025-38660", "lastModified": "2026-10-15T22:18:48.640", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38660", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:52:41.406590Z", "version": "2.0.3"}}]}, "published": "2025-08-22T16:15:41.193", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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", "url": "https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: [ceph] parse_longname(): strrchr() expects NUL-terminated string", "id": "2390343", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2390343"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\n[ceph] parse_longname(): strrchr() expects NUL-terminated string\n... and parse_longname() is not guaranteed that. That's 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.\nJust get a NUL-terminated copy of the entire thing and be done\nwith that..."], "name": "CVE-2025-38660", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38660\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38660\nhttps://lore.kernel.org/linux-cve-announce/2025082239-CVE-2025-38660-19fa@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-08-23T10:55:32.216432+00:00", "updated": "2025-08-23T10:55:32.216503+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}