{
  "cveId": "CVE-2026-80848",
  "url": "https://patchblox.com/security/cve/CVE-2026-80848",
  "summary": "CVE-2026-80848 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-80848, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "xfrm: espintcp: fix UAF during close",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: espintcp: fix UAF during close  ZDI reported and analyzed a race condition during close for espintcp sockets:      espintcp_close() frees emsg-\u003Eskb via kfree_skb() without holding     any socket lock. Concurrently, the xfrm_trans_reinject work queue     invokes esp_output_tcp_finish() -\u003E espintcp_push_skb() -\u003E     espintcp_push_msgs() -\u003E skb_send_sock_locked(), which reads the     same skb as a data source.  Fix this by adding a synchronize_rcu() call after resetting sk_prot, since esp_output_tcp_finish() runs under RCU and won\u0027t use a socket with sk_prot == \u0026tcp_prot.  Simply taking the socket lock in espintcp_close() could lead to leaks, if esp_output_tcp_finish() re-adds an skb in the slot we just freed. After this, the existing barrier() is no longer needed.",
  "published": "2026-09-04T16:18:13Z",
  "severity": "Moderate",
  "cvss": 5.9,
  "epss": 0.00195,
  "epssPercentile": 0.09268,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80848",
  "fixes": [
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      "released": "2026-11-07T00:43:02Z"
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}