{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43379",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43379"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-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-2026-43379"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ksmbd processes SMB2 traffic over the network on TCP/445, and the vulnerable close path is reached through SMB2 create/write/close requests from a remote client.\nAC:L - The attacker can create v2 lease state, trigger `reserve_lease_break` with SMB2 write, and repeatedly drive concurrent close/opinfo teardown using their own SMB requests or connections. The race is attacker-influenced and repeatable, so no external uncontrollable condition is required.\nPR:N - The path is post-session/tree-connect, but ksmbd supports guest/anonymous sessions and guest-access shares; in that reasonable deployment no prior credentials are needed. Under the required higher-severity rule, this is scored as no privileges required.\nUI:N - No victim user action is required after the ksmbd service and share are available; the attacker sends SMB requests directly.\nS:U - The vulnerable component and impacted resources are the same kernel/ksmbd security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - This is a use-after-free of `oplock_info`/lease state after dropping the RCU read lock. Freed kernel objects may be reclaimed and shaped through repeated SMB activity, making high confidentiality impact defensible.\nI:H - Use-after-free in kernel heap objects can be leveraged beyond a crash through object reuse and control-flow or data-structure corruption. Following the required UAF guidance, integrity impact is high.\nA:H - Even without full exploitation, dereferencing freed `oplock_info` or `o_lease` memory can cause a kernel oops or panic. The vulnerable path is remotely triggerable and repeatable, so availability impact is high."
    }
  }
}