{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-37947", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.972Z", "datePublished": "2025-05-20T16:01:43.788Z", "dateUpdated": "2026-08-05T11:58:33.808Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:58:33.808Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds stream writes by validating *pos\n\nksmbd_vfs_stream_write() did not validate whether the write offset\n(*pos) was within the bounds of the existing stream data length (v_len).\nIf *pos was greater than or equal to v_len, this could lead to an\nout-of-bounds memory write.\n\nThis patch adds a check to ensure *pos is less than v_len before\nproceeding. If the condition fails, -EINVAL is returned." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is in ksmbd, the in-kernel SMB server listening on TCP port 445, reached by sending a crafted SMB2 WRITE request to an alternate data stream; the attacker operates entirely over the network.\nAC:L - The attacker directly controls the write Offset (*pos) and the data payload; setting Offset ≥ stream length deterministically triggers the out-of-bounds write with no race or uncontrolled precondition.\nPR:L - The write path is post-authentication, requiring a valid SMB session, a tree connect to a writable share, and an open stream handle — achievable by any low-privileged authenticated SMB user, matching prior post-auth ksmbd scoring (CVE-2025-22040/22041).\nUI:N - Exploitation requires only that the attacker send SMB2 requests to the server; no action by any local user or victim is needed.\nS:U - The corruption occurs within the kernel's own memory and does not cross into a different security authority such as a VM host or IOMMU domain.\nC:H - The attacker-controlled-offset heap out-of-bounds write corrupts adjacent kernel memory and can be leveraged (e.g., manipulating adjacent objects) to disclose kernel memory, consistent with high confidentiality impact for memory corruption.\nI:H - The bug provides a controlled-offset, controlled-content out-of-bounds heap write, a powerful arbitrary-write primitive enabling kernel memory/control-flow corruption.\nA:H - Writing past the 64 KB buffer at a large attacker-chosen offset corrupts kernel heap/adjacent allocations and reliably causes an oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/vfs.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "7f61da79df86fd140c7768e668ad846bfa7ec8e1", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "04c8a38c60346bb5a7c49b276de7233f703ce9cb", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "d62ba16563a86aae052f96d270b3b6f78fca154c", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "e6356499fd216ed6343ae0363f4c9303f02c5034", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "0ca6df4f40cf4c32487944aaf48319cb6c25accc", "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/vfs.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.139", "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": "6.1.139" }, { "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/7f61da79df86fd140c7768e668ad846bfa7ec8e1" }, { "url": "https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cb" }, { "url": "https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154c" }, { "url": "https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034" }, { "url": "https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25accc" } ], "title": "ksmbd: prevent out-of-bounds stream writes by validating *pos", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2025-37947", "role": "CISA Coordinator", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-10T03:55:20.529301Z" } } } ], "references": [ { "url": "https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c", "tags": [ "exploit" ] } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-26T18:28:05.529Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:57:37.368Z" } } ] } }