{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31706",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31706"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()\n\nsmb_inherit_dacl() trusts the on-disk num_aces value from the parent\ndirectory's DACL xattr and uses it to size a heap allocation:\n\n  aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, ...);\n\nnum_aces is a u16 read from le16_to_cpu(parent_pdacl->num_aces)\nwithout checking that it is consistent with the declared pdacl_size.\nAn authenticated client whose parent directory's security.NTACL is\ntampered (e.g. via offline xattr corruption or a concurrent path that\nbypasses parse_dacl()) can present num_aces = 65535 with minimal\nactual ACE data.  This causes a ~8 MB allocation (not kzalloc, so\nuninitialized) that the subsequent loop only partially populates, and\nmay also overflow the three-way size_t multiply on 32-bit kernels.\n\nAdditionally, the ACE walk loop uses the weaker\noffsetof(struct smb_ace, access_req) minimum size check rather than\nthe minimum valid on-wire ACE size, and does not reject ACEs whose\ndeclared size is below the minimum.\n\nReproduced on UML + KASAN + LOCKDEP against the real ksmbd code path.\nA legitimate mount.cifs client creates a parent directory over SMB\n(ksmbd writes a valid security.NTACL xattr), then the NTACL blob on\nthe backing filesystem is rewritten to set num_aces = 0xFFFF while\nkeeping the posix_acl_hash bytes intact so ksmbd_vfs_get_sd_xattr()'s\nhash check still passes.  A subsequent SMB2 CREATE of a child under\nthat parent drives smb2_open() into smb_inherit_dacl() (share has\n\"vfs objects = acl_xattr\" set), which fails the page allocator:\n\n  WARNING: mm/page_alloc.c:5226 at __alloc_frozen_pages_noprof+0x46c/0x9c0\n  Workqueue: ksmbd-io handle_ksmbd_work\n   __alloc_frozen_pages_noprof+0x46c/0x9c0\n   ___kmalloc_large_node+0x68/0x130\n   __kmalloc_large_node_noprof+0x24/0x70\n   __kmalloc_noprof+0x4c9/0x690\n   smb_inherit_dacl+0x394/0x2430\n   smb2_open+0x595d/0xabe0\n   handle_ksmbd_work+0x3d3/0x1140\n\nWith the patch applied the added guard rejects the tampered value\nwith -EINVAL before any large allocation runs, smb2_open() falls back\nto smb2_create_sd_buffer(), and the child is created with a default\nSD.  No warning, no splat.\n\nFix by:\n\n  1. Validating num_aces against pdacl_size using the same formula\n     applied in parse_dacl().\n\n  2. Replacing the raw kmalloc(sizeof * num_aces * 2) with\n     kmalloc_array(num_aces * 2, sizeof(...)) for overflow-safe\n     allocation.\n\n  3. Tightening the per-ACE loop guard to require the minimum valid\n     ACE size (offsetof(smb_ace, sid) + CIFS_SID_BASE_SIZE) and\n     rejecting under-sized ACEs, matching the hardening in\n     smb_check_perm_dacl() and parse_dacl().\n\nv1 -> v2:\n  - Replace the synthetic test-module splat in the changelog with a\n    real-path UML + KASAN reproduction driven through mount.cifs and\n    SMB2 CREATE; Namjae flagged the kcifs3_test_inherit_dacl_old name\n    in v1 since it does not exist in ksmbd.\n  - Drop the commit-hash citation from the code comment per Namjae's\n    review; keep the parse_dacl() pointer.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31706"
    },
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      "url": "https://git.kernel.org/stable/c/063a7409b0de46d7c770b65bb0338e6fdb3b1f0a"
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    "severity": {
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      "scenario": "AV:N - ksmbd processes SMB2 CREATE requests over TCP/445, and the vulnerable `smb_inherit_dacl()` path is reached remotely through the in-kernel SMB server.\nAC:L - An attacker with access to a writable ACL-xattr share can deterministically store or arrange a malformed parent DACL and then create a child object to trigger inheritance; no race or uncontrollable condition is required.\nPR:L - The SMB2 CREATE path requires a valid SMB session and tree connection, and the practical attack requires share write/ACL-setting privileges, but not kernel, root, or administrative privileges.\nUI:N - After the attacker has SMB access, exploitation is driven entirely by attacker-sent SMB requests and does not require victim interaction.\nS:U - The vulnerable component and impacted resource are both within the same kernel/ksmbd security authority; this is not a VM escape or cross-boundary isolation bypass.\nC:H - The hardened ACE walk addresses attacker-controlled malformed DACL data that can drive out-of-bounds reads of kernel heap-backed security descriptor data; under the required high-severity tie-break rule, this is scored as high confidentiality impact.\nI:H - The malformed inherited ACE construction can corrupt kernel-managed ACL/security descriptor state and has plausible heap memory-corruption consequences, so the highest defensible integrity impact is high.\nA:H - The documented reproduction triggers a kernel allocator warning from attacker-controlled SMB activity, and such kernel warnings/oops conditions can crash or destabilize the server, especially with panic-on-warn configurations."
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}