{
  "cveId": "CVE-2026-64140",
  "url": "https://patchblox.com/security/cve/CVE-2026-64140",
  "summary": "CVE-2026-64140 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64140 (version 7.0.12-1), released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix null pointer dereference in proc_show...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix null pointer dereference in proc_show_files()  When a SMB2 client opens a file with a durable v2 handle and then issues SMB2 SESSION_LOGOFF, session_fd_check() clears fp-\u003Etcon = NULL on the reconnectable file pointer but leaves the fp registered in global_ft.idr until the durable scavenger fires (up to fp-\u003Edurable_timeout seconds later).  During that window any read of /proc/fs/ksmbd/files (mode 0400) panics the kernel because proc_show_files() walks global_ft.idr and unconditionally dereferences fp-\u003Etcon-\u003Eid with no NULL guard.  Reproducer requires only a successful SMB2 SESSION_SETUP and a share configured with \u0027durable handles = yes\u0027. KASAN report on mainline 70390501d194:    general protection fault, probably for non-canonical address   0xdffffc0000000000: 0000 [#1] SMP KASAN PTI   KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]   RIP: 0010:proc_show_files\u002B0x118/0x740   Call Trace:    proc_show_files\u002B0x118/0x740    seq_read_iter\u002B0x4ef/0xe10    proc_reg_read_iter\u002B0x1b7/0x280    ...  Guard the dereference. A durable-disconnected fp legitimately has no tcon; report its tree id as 0 rather than oopsing.",
  "published": "2026-07-19T16:17:55Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00488,
  "epssPercentile": 0.42281,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.12-1",
      "fix": "DEBIAN-CVE-2026-64140",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64140",
      "released": "2026-07-20T12:58:36Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}