{
  "cveId": "CVE-2026-64141",
  "url": "https://patchblox.com/security/cve/CVE-2026-64141",
  "summary": "CVE-2026-64141 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-64141, 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 compare_g...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: fix null pointer dereference in compare_guid_key()  session_fd_check() walks the per-inode m_op_list during durable-handle session teardown and sets op-\u003Econn = NULL for every opinfo whose conn matched the closing session\u0027s connection. The matching opinfo, however, stays linked in its per-ClientGuid lease_table_list entry\u0027s lb-\u003Elease_list because destroy_lease_table() only runs on full TCP-connection teardown, not on SESSION_LOGOFF.  If the same TCP connection then negotiates a fresh session with the same ClientGuid (ClientGuid is bound to NEGOTIATE, not the session, and is unchanged across LOGOFF \u002B SETUP) and issues a SMB2 CREATE with a lease context on a different inode, find_same_lease_key() walks lb-\u003Elease_list, reaches the stale opinfo, and calls compare_guid_key(), which unconditionally dereferences opinfo-\u003Econn-\u003EClientGUID. The conn pointer is NULL and the kernel panics.  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   0xdffffc0000000069: 0000 [#1] SMP KASAN PTI   KASAN: null-ptr-deref in range [0x0000000000000348-0x000000000000034f]   Workqueue: ksmbd-io handle_ksmbd_work   RIP: 0010:bcmp\u002B0x5b/0x230   Call Trace:    compare_guid_key\u002B0x4b/0xd0    find_same_lease_key\u002B0x324/0x690    smb2_open\u002B0x6aea/0x8e60    handle_ksmbd_work\u002B0x796/0xee0    ...  Faulting address 0x348 is the offset of ClientGUID within struct ksmbd_conn, confirming opinfo-\u003Econn was NULL.  Read opinfo-\u003Econn once and bail out if it has been cleared by a concurrent session_fd_check(). A half-detached opinfo cannot be the owner of an active lease, so returning 0 is the correct match result.",
  "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": 0.0063,
  "epssPercentile": 0.50434,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.94-1",
      "fix": "DEBIAN-CVE-2026-64141",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64141",
      "released": "2026-07-20T12:58:36Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.12-1",
      "fix": "DEBIAN-CVE-2026-64141",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64141",
      "released": "2026-07-20T12:58:36Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}