{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-26952", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-26952" ], "published": "2024-05-01T05:22:01Z", "summary": "ksmbd: fix potencial out-of-bounds when buffer offset is invalid", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix potencial out-of-bounds when buffer offset is invalid\n\nI found potencial out-of-bounds when buffer offset fields of a few requests\nis invalid. This patch set the minimum value of buffer offset field to\n->Buffer offset to validate buffer length.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7l", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v8", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-2712", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": 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ancestry (strak rule)", "upstream_fixed": "6.6.32" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.32" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-26952" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/480469f145e5abf83361e608734e421b7d99693d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/ad6480c9a5d884e2704adc51d69895d93339176c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/39bdc4197acf2ed13269167ccf093ee28cfa2a4e" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2dcda336b6e80b72d58d30d40f2fad9724e5fe63" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0c5541b4c980626fa3cab16ba1a451757778bbb5" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c6cd2e8d2d9aa7ee35b1fa6a668e32a22a9753da" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.3, "cvss_v3_severity": "High", "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the malformed offset fields are attacker-supplied bytes in an SMB2 PDU sent over the network. No local access is needed.\nAC:L - The attacker simply sets a buffer-offset field (PathOffset, InputBufferOffset, BufferOffset, FileNameOffset, InputOffset) below the struct's Buffer offset in a single crafted request; the divergence between the validated window and the read window is deterministic, with no race or unknown state involved.\nPR:L - All affected commands pass through smb2_check_user_session(), which requires ksmbd_conn_good() and a valid session, so a completed SMB2 session setup (any low-privileged share user, or a mapped guest) is needed; the remaining commands additionally need a tree connect. This matches the sibling fix CVE-2024-26954.\nUI:N - The server processes the crafted SMB2 request automatically in its kworker; no action by any local user or administrator is required.\nS:U - The out-of-bounds access and its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is an out-of-bounds read of adjacent kernel heap memory of up to the fixed-header size (~120 bytes) per request, repeatable with attacker-controlled heap grooming, and the leaked bytes are reflected back to the client through FSCTL_PIPE_TRANSCEIVE responses, tree-connect/query-directory name handling and EA replies, yielding kernel memory disclosure.\nI:L - SMB2_SET_INFO and FSCTL handlers consume the out-of-bounds bytes as file metadata \u2014 FILE_END_OF_FILE_INFORMATION truncation lengths, rename/link names, extended attributes, security descriptors and FSCTL_SET_ZERO_DATA ranges \u2014 so file data and permissions are modified, but the attacker does not fully control the resulting values.\nA:H - Reading past the kvmalloc()'d request buffer triggers a KASAN slab-out-of-bounds BUG or a fault on a vmalloc guard page, oopsing the ksmbd kworker and killing the server; the attacker can repeat it at will from the network." } } }