{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38660", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.031Z", "datePublished": "2025-08-22T16:01:03.686Z", "dateUpdated": "2026-08-05T12:03:47.196Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:03:47.196Z" }, "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..." } ], "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 — 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 — 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 — 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": "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": "6.12.42", "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": "6.12.42" }, { "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/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" } } } }