{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-26954", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-26954" ], "published": "2024-05-01T05:22:01Z", "summary": "ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()\n\nIf ->NameOffset of smb2_create_req is smaller than Buffer offset of\nsmb2_create_req, slab-out-of-bounds read can happen from smb2_open.\nThis patch set the minimum value of the name offset to the buffer offset\nto validate name length of smb2_create_req().", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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", 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(no usable Linux commit)", "upstream_fixed": "6.1.119" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.119" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.32" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit 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-2024-26954" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d70c2e0904ab3715c5673fd45788a464a246d1db" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9e4937cbc150f9d5a9b5576e1922ef0b5ed2eb72" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/3b8da67191e938a63d2736dabb4ac5d337e5de57" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4f97e6a9d62cb1fce82fbf4baff44b83221bc178" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a80a486d72e20bd12c335bcd38b6e6f19356b0aa" } ], "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": 8.1, "cvss_v3_severity": "High", "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the malformed SMB2_CREATE PDU with the bogus NameOffset arrives directly from a remote peer over the network. No local access to the target is needed.\nAC:L - A single hand-crafted CREATE request deterministically triggers it \u2014 set NameOffset=0, a large NameLength, and CreateContextsOffset/Length such that name_off+name_len < ctx_off+ctx_len; there is no race, no memory-layout luck, and the attacker even chooses the kvmalloc size (pdu_size) that selects the adjacent slab or forces a page-aligned allocation next to a guard page.\nPR:L - SMB2_CREATE is dispatched only after smb2_check_user_session() finds a valid SessionId and smb2_get_ksmbd_tcon() resolves a live tree connect, so the attacker needs an established SMB session \u2014 which on the common NAS/embedded ksmbd deployment is satisfied by any ordinary user account or a guest-enabled share.\nUI:N - The attacker's own authenticated SMB connection drives the entire sequence; no administrator or local user on the target has to take any action.\nS:U - The out-of-bounds slab read and any resulting fault occur entirely within the kernel's own security authority, crossing no VM, IOMMU, or sandbox boundary.\nC:H - Up to ~120 bytes of adjacent kernel slab memory are read past conn->request_buf, in a slab cache the attacker selects by choosing the RFC1002 pdu_size, and the leaked bytes are converted into the filename used by smb2_open() \u2014 so with FILE_CREATE the attacker can create a file named with kernel heap contents and read it back via SMB2_QUERY_DIRECTORY, yielding repeatable remote kernel memory disclosure well beyond a few bounded bytes.\nI:N - The defect is strictly an over-read in smb_utf16_bytes()/smb_from_utf16(); nothing is written out of bounds and no kernel state is corrupted on this path.\nA:H - The read crosses the end of the kvmalloc'd request buffer, and because the attacker controls the allocation size exactly it can be made to land on a vmalloc guard page for an unrecoverable kernel page fault, while KASAN/KFENCE/MTE kernels report and panic under panic_on_warn=1 or kasan.fault=panic; the request can be replayed at will from new connections." } } }