{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97555",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-97555"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "smb: client: fix heap overflow in DACL owner/group rewrite",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix heap overflow in DACL owner/group rewrite\n\nWhen id_mode_to_cifs_acl rewrites an existing DACL, it allocates a\nbuffer sized according to the on-disk DACL length reported by\ndacl_ptr->size. However, replace_sids_and_copy_aces may rewrite each\nACE with a new owner/group SID obtained from the cifs.idmap upcall.\nThose SIDs can have up to SID_MAX_SUB_AUTHORITIES (15) sub-authorities,\nmaking each ACE up to 76 bytes (sizeof(struct smb_ace)).\n\nIf the original DACL contains short SIDs (e.g., 1 sub-authority) while\nthe replacement SIDs are long, the rewritten ACEs overflow the\nallocation.\n\nFix this by always budgeting for worst-case SID expansion: allocate\nsizeof(struct smb_acl) plus num_aces * sizeof(struct smb_ace), which\ncovers the smb_acl header and room for every ACE at maximum SID size.\nThis replaces the previous split logic that used dacl_ptr->size for\ncifsacl mounts but num_aces * sizeof(struct smb_ace) for mode_from_sid\nmounts: both paths can trigger the same rewrite and need the same\nheadroom.\n\nKASAN reports this as:\n  BUG: KASAN: slab-out-of-bounds in build_sec_desc+0x1e8a/0x2680 [cifs]\n  Write of size 4 at addr ffff8881a5e25374 by task chown/5298\n  ...\n  The buggy address is located 0 bytes to the right of\n   allocated 884-byte region [ffff8881a5e25000, ffff8881a5e25374)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97555"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - chown/chgrp reaches id_mode_to_cifs_acl via cifs_setattr_nounix, which fetches the NTSD through get_smb2_acl \u2192 SMB2_query_acl (SMB2 QUERY_INFO, InfoType=SMB2_O_INFO_SECURITY). The DACL that undersizes the kzalloc (dacl_ptr->size and short ACE SIDs) is that response body from a remote SMB server on TCP/445.\nAC:L - After setattr hits id_mode_to_cifs_acl's chown branch, overflow is deterministic: the server returns 1-sub-authority owner ACEs so dacl_ptr->size is compact, while idsfromsid builds a 3-sub-authority S-1-5-88 SID and id_to_sid() can return up to 15, and replace_sids_and_copy_aces/cifs_copy_ace writes the expanded ACEs with no race.\nPR:N - The attacker is the SMB server answering SMB2_query_acl on the existing tree-connect and holds no uid, share credential, or capability on the client. Local chown_ok/CAP_CHOWN belongs to the victim who issues chown/chgrp, not to the server.\nUI:R - The overflowing allocation is only in id_mode_to_cifs_acl's ATTR_UID/ATTR_GID (chown/chgrp) branch from cifs_setattr_nounix, so a user must chown(2) or chgrp(2) a file on a cifsacl, modefromsid, or posix_extensions CIFS mount of the attacker's share; lookup/stat/read never rewrite that DACL.\nS:U - The overflow is of the kmalloc'd pnntsd buffer inside id_mode_to_cifs_acl/build_sec_desc on the CIFS client host and stays in that kernel's own authority; it is not a VM, IOMMU, or sandbox escape.\nC:H - replace_sids_and_copy_aces heap-overflows pnntsd in build_sec_desc (KASAN slab-out-of-bounds write of expanded ACE/SID bytes). Corrupting neighboring slab objects is a kernel-memory disclosure primitive, so confidentiality is High.\nI:H - cifs_copy_ace writes server-chosen ACE type/flags/access_req and a longer SID past the end of id_mode_to_cifs_acl's kzalloc buffer, an out-of-bounds heap write that can corrupt adjacent objects and hijack control flow.\nA:H - The same out-of-bounds write in build_sec_desc was reported as KASAN slab-out-of-bounds by task chown and can oops or panic the client kernel, fully denying availability."
    }
  }
}