{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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 'durable handles = yes'. 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+0x118/0x740   Call Trace:    proc_show_files+0x118/0x740    seq_read_iter+0x4ef/0xe10    proc_reg_read_iter+0x1b7/0x280    ...  Guard the dereference. A durable-disconnected fp legitimately has no tcon; report its tree id as 0 rather than oopsing.",
  "id": "DEBIAN-CVE-2026-64140",
  "modified": "2026-09-14T16:47:40.641381579Z",
  "published": "2026-07-19T16:17:55.887Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64140"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64140"
  ]
}