CVE-2025-68806

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-68806", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T10:30:51.045Z", "datePublished": "2026-01-13T15:29:13.797Z", "dateUpdated": "2026-08-05T12:11:38.392Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:11:38.392Z"}, "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."}], "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."}]}], "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": "d070c4dd2a5bed4e9832eec5b6c029c7d14892ea", "lessThan": "cae52c592a07e1d3fa3338a5f064a374a5f26750", "status": "affected", "versionType": "git"}, {"version": "0ba5439d9afa2722e7728df56f272c89987540a4", "lessThan": "a28a375a5439eb474e9f284509a407efb479c925", "status": "affected", "versionType": "git"}, {"version": "0ba5439d9afa2722e7728df56f272c89987540a4", "lessThan": "d26af6d14da43ab92d07bc60437c62901dc522e6", "status": "affected", "versionType": "git"}, {"version": "0ba5439d9afa2722e7728df56f272c89987540a4", "lessThan": "6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4", "status": "affected", "versionType": "git"}, {"version": "0ba5439d9afa2722e7728df56f272c89987540a4", "lessThan": "95d7a890e4b03e198836d49d699408fd1867cb55", "status": "affected", "versionType": "git"}, {"version": "bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c", "status": "affected", "versionType": "git"}, {"version": "1a13ecb96230e8b7b91967e292836f7b01ec8111", "status": "affected", "versionType": "git"}, {"version": "404e7c01e16288b5e0171d1d8fd3328e806d0794", "status": "affected", "versionType": "git"}, {"version": "6.1.52", "lessThan": "6.1.160", "status": "affected", "versionType": "semver"}, {"version": "5.15.131", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "6.4.15", "lessThan": "6.5", "status": "affected", "versionType": "semver"}, {"version": "6.5.2", "lessThan": "6.6", "status": "affected", "versionType": "semver"}]}, {"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": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.160", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.3", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "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": "6.1.52", "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"}]}]}], "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"}], "title": "ksmbd: fix buffer validation by including null terminator size in EA length", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cae52c592a07e1d3fa3338a5f064a374a5f26750", "status": "affected", "version": "d070c4dd2a5bed4e9832eec5b6c029c7d14892ea", "versionType": "git"}, {"lessThan": "a28a375a5439eb474e9f284509a407efb479c925", "status": "affected", "version": "0ba5439d9afa2722e7728df56f272c89987540a4", "versionType": "git"}, {"lessThan": "d26af6d14da43ab92d07bc60437c62901dc522e6", "status": "affected", "version": "0ba5439d9afa2722e7728df56f272c89987540a4", "versionType": "git"}, {"lessThan": "6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4", "status": "affected", "version": "0ba5439d9afa2722e7728df56f272c89987540a4", "versionType": "git"}, {"lessThan": "95d7a890e4b03e198836d49d699408fd1867cb55", "status": "affected", "version": "0ba5439d9afa2722e7728df56f272c89987540a4", "versionType": "git"}, {"status": "affected", "version": "bb5bf157b5be1643cccc7cbbe57fcdef9ae52c2c", "versionType": "git"}, {"status": "affected", "version": "1a13ecb96230e8b7b91967e292836f7b01ec8111", "versionType": "git"}, {"status": "affected", "version": "404e7c01e16288b5e0171d1d8fd3328e806d0794", "versionType": "git"}, {"lessThan": "6.1.160", "status": "affected", "version": "6.1.52", "versionType": "semver"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.131", "versionType": "semver"}, {"lessThan": "6.5", "status": "affected", "version": "6.4.15", "versionType": "semver"}, {"lessThan": "6.6", "status": "affected", "version": "6.5.2", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.160", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.120", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.64", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: corrige la validaci\u00f3n del b\u00fafer al incluir el tama\u00f1o del terminador nulo en la longitud de EA\n\nLa funci\u00f3n smb2_set_ea, que maneja los Atributos Extendidos (EA),\nestaba realizando comprobaciones de validaci\u00f3n del b\u00fafer que omit\u00edan incorrectamente el tama\u00f1o\ndel car\u00e1cter de terminaci\u00f3n nula (+1 byte) para el Nombre de EA.\nEste parche corrige el problema al a\u00f1adir expl\u00edcitamente '+ 1' a EaNameLength donde\nse espera que el terminador nulo est\u00e9 presente en el b\u00fafer, asegurando\nque la validaci\u00f3n refleje con precisi\u00f3n el tama\u00f1o total de b\u00fafer requerido."}], "id": "CVE-2025-68806", "lastModified": "2026-07-30T06:24:46.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-01-13T16:16:02.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: ksmbd: fix buffer validation by including null terminator size in EA length", "id": "2429108", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429108"}, "csaw": false, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix buffer validation by including null terminator size in EA length\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."], "name": "CVE-2025-68806", "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": "2026-01-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-68806\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68806\nhttps://lore.kernel.org/linux-cve-announce/2026011310-CVE-2025-68806-a2fb@gregkh/T"]}

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