CVE-2025-37956

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No local access is involved.\nAC:L - The attacker deterministically triggers the uninitialized-qstr dereference by sending one SET_INFO request with FileNameLength=2 containing a UTF-16 NUL; no race or unpredictable precondition is required, and the stack residue that shapes the outcome is influenced by the attacker's own preceding requests on the same ksmbd worker.\nPR:L - smb2_set_info requires an established session, a tree connect to a writable share, and an open handle with FILE_DELETE access, so a low-privileged authenticated SMB account (or a guest-mapped session on guest-enabled shares) is needed. This matches sibling post-auth ksmbd CVEs such as CVE-2025-22040/22041.\nUI:N - The server processes the crafted rename request automatically in its worker thread; no action by any local user or administrator is needed.\nS:U - The wild read, dentry corruption and crash all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - __d_alloc() memcpy's from an uninitialized kernel-stack pointer with an uncontrolled length \u2014 an unbounded out-of-bounds read whose contents become the new dentry name, which the attacker can then read back over SMB via directory enumeration, disclosing kernel heap/stack data and pointers.\nI:H - The rename completes against a target derived from uninitialized kernel memory and leaves a dentry cached with a bogus d_name.len driving later name-switching memcpy's; on 32-bit ksmbd builds the `size + name->len` computation in __d_alloc() overflows, producing an undersized allocation followed by a multi-gigabyte memcpy \u2014 a heap write primitive.\nA:H - The commit states the empty name causes a kernel oops from d_alloc; a remote client can repeat the request at will to keep panicking the server, so availability loss is total."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/smb2pdu.c"], "versions": [{"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "35e2964e93d95185d2db0c0ffd9959d0197b3956", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "6ee551672c8cf36108b0cfba92ec0c7c28ac3439", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "c57301e332cc413fe0a7294a90725f4e21e9549d", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "d7f2c00acb1ef64304fd40ac507e9213ff1d9b5c", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "53e3e5babc0963a92d856a5ec0ce92c59f54bc12", "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/smb/server/smb2pdu.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.91", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.29", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.7", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "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": "5.15", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.29"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/35e2964e93d95185d2db0c0ffd9959d0197b3956"}, {"url": "https://git.kernel.org/stable/c/6ee551672c8cf36108b0cfba92ec0c7c28ac3439"}, {"url": "https://git.kernel.org/stable/c/c57301e332cc413fe0a7294a90725f4e21e9549d"}, {"url": "https://git.kernel.org/stable/c/d7f2c00acb1ef64304fd40ac507e9213ff1d9b5c"}, {"url": "https://git.kernel.org/stable/c/53e3e5babc0963a92d856a5ec0ce92c59f54bc12"}], "title": "ksmbd: prevent rename with empty string", "x_generator": {"engine": "bippy-1.2.0"}}}}

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El cliente puede enviar una cadena vac\u00eda de nombre nuevo al servidor ksmbd. Esto provocar\u00e1 un error de kernel desde d_alloc. Este parche devuelve el error al intentar renombrar un archivo o directorio con una cadena vac\u00eda de nombre nuevo."}], "id": "CVE-2025-37956", "lastModified": "2026-10-30T13:17:59.040", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "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"}]}, "published": "2025-05-20T16:15:33.813", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35e2964e93d95185d2db0c0ffd9959d0197b3956"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53e3e5babc0963a92d856a5ec0ce92c59f54bc12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ee551672c8cf36108b0cfba92ec0c7c28ac3439"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c57301e332cc413fe0a7294a90725f4e21e9549d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7f2c00acb1ef64304fd40ac507e9213ff1d9b5c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: prevent rename with empty string", "id": "2367582", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367582"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: prevent rename with empty string\nClient can send empty newname string to ksmbd server.\nIt will cause a kernel oops from d_alloc.\nThis patch return the error when attempting to rename\na file or directory with an empty new name string."], "name": "CVE-2025-37956", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37956\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37956\nhttps://lore.kernel.org/linux-cve-announce/2025052002-CVE-2025-37956-a6aa@gregkh/T"], "threat_severity": "Low"}

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