{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46243",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46243"
  ],
  "published": "2026-06-01T16:21:47Z",
  "summary": "smb: client: reject userspace cifs.spnego descriptions",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46243"
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      "scenario": "AV:L - Exploitation requires local `request_key(2)` or `add_key(2)` from an unprivileged process; the flaw is missing origin validation in the keyring path, not remote SMB/CIFS protocol input.\nAC:L - On typical affected systems (CIFS module with upcall, cifs-utils request-key rule, unprivileged user/mount namespaces), the attacker fully controls the forged description, target pid, and namespace layout for a reliable root upcall chain.\nPR:L - Any local unprivileged user account can invoke the key syscalls; user/mount namespaces are part of the standard exploit setup and map to basic local user capability, not root-only access.\nUI:N - No victim action such as mounting a Kerberos CIFS share is required; the attacker forges the key request directly without depending on another user\u2019s mount or session.\nS:U - Successful exploitation elevates privileges within the same host/kernel security domain (local root) and does not cross a VM/hypervisor or hardware isolation boundary by itself.\nC:H - The attack chain yields root-equivalent access in the root upcall helper, enabling arbitrary read of host data (full confidentiality compromise of the system).\nI:H - Malicious NSS modules run as root inside `cifs.upcall`, giving arbitrary code execution and full integrity compromise of the host, not merely limited data modification.\nA:N - The kernel bug is a trust-boundary failure without memory corruption or guaranteed kernel panic; primary impact is privilege escalation rather than kernel crash or sustained denial of service."
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}