CVE-2026-31612

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ksmbd is an in-kernel SMB server reachable over TCP/445, and the vulnerable path is triggered by a remote SMB2 QUERY_INFO request for FILE_FULL_EA_INFORMATION.\nAC:L - The attacker can craft the InputBufferLength/EaNameLength mismatch directly and repeatedly; there is no race or condition outside attacker control beyond reaching a normal share/file with extended attributes.\nPR:N - The path requires a valid SMB session, tree connection, and file handle, but ksmbd supports guest/anonymous sessions and guest-accessible shares, making unauthenticated exploitation reasonable in the highest-severity deployment scenario.\nUI:N - No victim action is required after the SMB service and share are available; the attacker sends protocol requests directly.\nS:U - The vulnerable component and impacted memory are within the same kernel security authority, with no VM, sandbox, or separate authorization boundary crossed.\nC:H - The unchecked EaNameLength causes an out-of-bounds heap read in strncmp(), and the fix explicitly describes leaking uninitialized heap values to the client; under the required guidance, out-of-bounds reads are High unless strictly limited to a few bytes.\nI:N - The bug is an over-read used for comparison and response selection, with no out-of-bounds write or direct data modification primitive identified.\nA:N - The demonstrated impact is information disclosure from a bounded heap over-read, and the investigated path does not show a reliable kernel panic, hang, or memory corruption condition."}]}], "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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "859f11e1bc81a4d32bb3ceeae54bcd296ac675d3", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "4b73376feecb3b61172fe5b4ff42bbbb8531669d", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "551dfb15b182abad4600eaf7b37e6eb7000d5b1b", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "3363a770b193f555f29d76ddf4ced3305c0ccf6d", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "243b206bcb5a7137e8bddd57b2eec81e1ebd3859", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "dfc6878d14acafffbe670bf2576620757a10a3d8", "status": "affected", "versionType": "git"}, {"version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "66751841212c2cc196577453c37f7774ff363f02", "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": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.1", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/859f11e1bc81a4d32bb3ceeae54bcd296ac675d3"}, {"url": "https://git.kernel.org/stable/c/4b73376feecb3b61172fe5b4ff42bbbb8531669d"}, {"url": "https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b"}, {"url": "https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d"}, {"url": "https://git.kernel.org/stable/c/243b206bcb5a7137e8bddd57b2eec81e1ebd3859"}, {"url": "https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8"}, {"url": "https://git.kernel.org/stable/c/66751841212c2cc196577453c37f7774ff363f02"}], "title": "ksmbd: validate EaNameLength in smb2_get_ea()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:17:11.549Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - 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Sin esta comprobaci\u00f3n, los valores de pila no inicializados podr\u00edan filtrarse lentamente al cliente."}], "id": "CVE-2026-31612", "lastModified": "2026-11-11T23:10:00.263", "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": "2026-04-24T15:16:40.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/243b206bcb5a7137e8bddd57b2eec81e1ebd3859"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b73376feecb3b61172fe5b4ff42bbbb8531669d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66751841212c2cc196577453c37f7774ff363f02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/859f11e1bc81a4d32bb3ceeae54bcd296ac675d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "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: validate EaNameLength in smb2_get_ea()", "id": "2461571", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461571"}, "csaw": false, "cwe": "CWE-130", "details": ["A flaw was found in ksmbd, a Linux kernel module. A remote attacker can exploit this vulnerability by sending a specially crafted client request to the `smb2_get_ea()` function. Due to improper validation of the `EaNameLength` field, the system may leak uninitialized heap memory values, leading to information disclosure."], "name": "CVE-2026-31612", "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31612\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31612\nhttps://lore.kernel.org/linux-cve-announce/2026042422-CVE-2026-31612-24a7@gregkh/T"]}

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