{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56627", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T14:03:06.018Z", "datePublished": "2024-12-27T14:51:29.854Z", "dateUpdated": "2026-08-05T11:45:32.397Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:32.397Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read\n\nAn offset from client could be a negative value, It could lead\nto an out-of-bounds read from the stream_buf.\nNote that this issue is coming when setting\n'vfs objects = streams_xattr parameter' in ksmbd.conf." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the malicious `Offset` field arrives in an SMB2 READ request from a remote peer over the network. No local access to the target is needed.\nAC:L - The attacker fully and deterministically controls both the negative offset and the read length, and creates all preconditions itself (open `file:stream`, write one byte, then read at a negative offset); no race, no memory-layout luck, and no condition outside the attacker's control is required.\nPR:L - `smb2_check_user_session()` requires an established SMB2 session and tree connect before SMB2_READ is dispatched, so the attacker needs credentials for the share (or a guest-ok share), i.e. the privileges of an ordinary SMB user.\nUI:N - The entire sequence (CREATE with a stream name, WRITE, READ with negative offset) is driven by the attacker's own SMB connection; no administrator or user on the target has to do anything.\nS:U - The out-of-bounds read and its disclosure occur wholly within the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-controlled 64-bit negative displacement turns `memcpy(buf, &stream_buf[*pos], count)` into an effectively arbitrary kernel-memory read of up to 4 MB per request, and the bytes are returned directly to the remote client in the READ response — disclosing kernel pointers, credentials, keys, and other users' cached file data, repeatably.\nI:N - The defect is purely a read; the destination `aux_payload_buf` is `kvzalloc(length)` with `count <= length`, so no kernel memory is written or corrupted by this bug.\nA:H - A large negative offset makes the kernel `memcpy` from an unmapped or invalid address, producing an unhandled kernel page fault/oops that kills the ksmbd worker thread and panics the box on `panic_on_oops` configurations; it can be retriggered at will." } ] } ], "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": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "6bd1bf0e8c42f10a9a9679a4c103a9032d30594d", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "de4d790dcf53be41736239d7ee63849a16ff5d10", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "27de4295522e9a33e4a3fc72f7b8193df9eebe41", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "81eed631935f2c52cdaf6691c6d48e0b06e8ad73", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9", "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": "5.15.176", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "5.15.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6bd1bf0e8c42f10a9a9679a4c103a9032d30594d" }, { "url": "https://git.kernel.org/stable/c/de4d790dcf53be41736239d7ee63849a16ff5d10" }, { "url": "https://git.kernel.org/stable/c/27de4295522e9a33e4a3fc72f7b8193df9eebe41" }, { "url": "https://git.kernel.org/stable/c/81eed631935f2c52cdaf6691c6d48e0b06e8ad73" }, { "url": "https://git.kernel.org/stable/c/fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9" } ], "title": "ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-56627", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:00:48.902752Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:12.432Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:51:16.745Z" } } ] } }