{
  "cveId": "CVE-2025-40256",
  "url": "https://patchblox.com/security/cve/CVE-2025-40256",
  "summary": "CVE-2025-40256 is fixed in 40 products on 1 platform, first by DEBIAN-CVE-2025-40256, released December 4, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  xfrm: also call xfrm_state_delete_tunnel at dest...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: also call xfrm_state_delete_tunnel at destroy time for states that were never added  In commit b441cf3f8c4b (\u0022xfrm: delete x-\u003Etunnel as we delete x\u0022), I missed the case where state creation fails between full initialization (-\u003Einit_state has been called) and being inserted on the lists.  In this situation, -\u003Einit_state has been called, so for IPcomp tunnels, the fallback tunnel has been created and added onto the lists, but the user state never gets added, because we fail before that. The user state doesn\u0027t go through __xfrm_state_delete, so we don\u0027t call xfrm_state_delete_tunnel for those states, and we end up leaking the FB tunnel.  There are several codepaths affected by this: the add/update paths, in both net/key and xfrm, and the migrate code (xfrm_migrate, xfrm_state_migrate). A \u0022proper\u0022 rollback of the init_state work would probably be doable in the add/update code, but for migrate it gets more complicated as multiple states may be involved.  At some point, the new (not-inserted) state will be destroyed, so call xfrm_state_delete_tunnel during xfrm_state_gc_destroy. Most states will have their fallback tunnel cleaned up during __xfrm_state_delete, which solves the issue that b441cf3f8c4b (and other patches before it) aimed at. All states (including FB tunnels) will be removed from the lists once xfrm_state_fini has called flush_work(\u0026xfrm_state_gc_work).",
  "published": "2025-12-04T16:16:19Z",
  "severity": "IMPORTANT",
  "cvss": 7.1,
  "epss": 0.0022,
  "epssPercentile": 0.12573,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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