{"id":"CVE-2025-68806","state":"PUBLISHED","title":"ksmbd: fix buffer validation by including null terminator size in EA length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding '+ 1' to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size.","publishedAt":"2026-01-13T15:29:13.797Z","updatedAt":"2026-08-05T12:11:38.392Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d070c4dd2a5bed4e9832eec5b6c029c7d14892ea","status":"affected","lessThan":"cae52c592a07e1d3fa3338a5f064a374a5f26750","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"a28a375a5439eb474e9f284509a407efb479c925","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"d26af6d14da43ab92d07bc60437c62901dc522e6","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"95d7a890e4b03e198836d49d699408fd1867cb55","versionType":"git"},{"version":"bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c","status":"affected","versionType":"git"},{"version":"1a13ecb96230e8b7b91967e292836f7b01ec8111","status":"affected","versionType":"git"},{"version":"404e7c01e16288b5e0171d1d8fd3328e806d0794","status":"affected","versionType":"git"},{"version":"6.1.52","status":"affected","lessThan":"6.1.160","versionType":"semver"},{"version":"5.15.131","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.4.15","status":"affected","lessThan":"6.5","versionType":"semver"},{"version":"6.5.2","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750","https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925","https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6","https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4","https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68806.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68806","state":"PUBLISHED","datePublished":"2026-01-13T15:29:13.797Z","dateUpdated":"2026-08-05T12:11:38.392Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:30:51.045Z"},"containers":{"cna":{"title":"ksmbd: fix buffer validation by including null terminator size in EA length","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding '+ 1' to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d070c4dd2a5bed4e9832eec5b6c029c7d14892ea","status":"affected","lessThan":"cae52c592a07e1d3fa3338a5f064a374a5f26750","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"a28a375a5439eb474e9f284509a407efb479c925","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"d26af6d14da43ab92d07bc60437c62901dc522e6","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4","versionType":"git"},{"version":"0ba5439d9afa2722e7728df56f272c89987540a4","status":"affected","lessThan":"95d7a890e4b03e198836d49d699408fd1867cb55","versionType":"git"},{"version":"bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c","status":"affected","versionType":"git"},{"version":"1a13ecb96230e8b7b91967e292836f7b01ec8111","status":"affected","versionType":"git"},{"version":"404e7c01e16288b5e0171d1d8fd3328e806d0794","status":"affected","versionType":"git"},{"version":"6.1.52","status":"affected","lessThan":"6.1.160","versionType":"semver"},{"version":"5.15.131","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.4.15","status":"affected","lessThan":"6.5","versionType":"semver"},{"version":"6.5.2","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"},{"url":"https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925"},{"url":"https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6"},{"url":"https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4"},{"url":"https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The flaw is reachable by a remote SMB2/3 client through ksmbd's SMB2 SET_INFO handler over TCP, normally port 445.\nAC:L - The client directly controls the EA lengths and contents, so one deterministic malformed request triggers the over-read without a race or an external condition.\nPR:N - Ksmbd supports passwordless guest sessions on guest-writable shares, where a remote client can obtain FILE_WRITE_EA access. Under the required highest-severity reasonable deployment, no prior privileges are needed.\nUI:N - The attacker can send the necessary SET_INFO and QUERY_INFO requests without any victim action.\nS:U - The disclosure affects the ksmbd host kernel and does not cross a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The malformed EA stores an uninitialized receive-buffer byte in a user xattr that the client can query. Repeated requests with heap grooming can slowly disclose kernel heap contents, warranting high confidentiality impact under conservative scoring.\nI:N - The flaw does not corrupt kernel memory or provide a kernel write primitive; it only changes a user xattr that the client is already authorized to set.\nA:N - The receive allocation includes an extra tail byte, so the faulty copy reads uninitialized in-allocation data rather than faulting; no crash, hang, or resource exhaustion results."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:11:38.392Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.52","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}