{"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"}}]}}