{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64386",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64386"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "smb: client: fix query_info() replay double-free",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix query_info() replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_query_info_init() fails before the next send,\ncleanup retains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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-2026-64386"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4"
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      "url": "https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - A malicious or compromised SMB2/3 server can remotely return a response-bearing replayable error and manipulate the subsequent connection state, reaching the vulnerable client over TCP.\nAC:L - The server controls the error response, disconnect, and reconnection sequence and can repeat it until the stale free occurs. Replay-enabled hard or retrans-configured SMB mounts are a reasonable deployment.\nPR:N - The malicious SMB peer needs no privileges or credentials on the client; SMB session setup authenticates the client to the server, not the attacker to the victim kernel.\nUI:N - Once the share is mounted, ordinary or automated file and metadata operations issue query-info requests, and exploitation requires no human action during the crafted response and reconnect sequence.\nS:U - The corruption and resulting impacts occur within the same Linux kernel security authority, without crossing a VM, sandbox, or IOMMU boundary.\nC:H - The double-free corrupts SMB response-buffer slab and mempool state, enabling aliased or use-after-free buffers that can be leveraged to expose kernel memory.\nI:H - Allocator freelist corruption and reuse of one buffer by concurrent SMB operations can provide attacker-controlled modification of live kernel memory and support control-flow hijacking.\nA:H - The repeated free can immediately cause allocator corruption, a BUG, kernel oops, or panic, and the malicious server can trigger the sequence repeatedly."
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}