{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593"
            },
            {
              "fixed": "29121c5e6591da527e8e36ddac7120dc527f574d"
            },
            {
              "fixed": "ed5d9102190c45fc70121c036b0626b740040b75"
            },
            {
              "fixed": "4bc0dfa28dca6fc0084203732695968049c44072"
            },
            {
              "fixed": "ff8dd7a932f34409a56e1b91a1219340f17457e9"
            },
            {
              "fixed": "4b31a875693c480c611519faca46216514e3e052"
            },
            {
              "fixed": "24efebecf415ba264adba0f0491cec436463a14f"
            },
            {
              "fixed": "eb3bbf29c723fe75c0eb92be14f0ec92971fe272"
            },
            {
              "fixed": "54b41ad14da9a981131ab6e4d3f79321a503ea5d"
            },
            {
              "fixed": "deb232e884877bf10b4ce2580909eedec986c284"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.269"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.220"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.187"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.156"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.13"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80848.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: fix UAF during close\n\nZDI reported and analyzed a race condition during close for espintcp\nsockets:\n\n    espintcp_close() frees emsg-\u003eskb via kfree_skb() without holding\n    any socket lock. Concurrently, the xfrm_trans_reinject work queue\n    invokes esp_output_tcp_finish() -\u003e espintcp_push_skb() -\u003e\n    espintcp_push_msgs() -\u003e skb_send_sock_locked(), which reads the\n    same skb as a data source.\n\nFix this by adding a synchronize_rcu() call after resetting sk_prot,\nsince esp_output_tcp_finish() runs under RCU and won't use a socket\nwith sk_prot == \u0026tcp_prot.  Simply taking the socket lock in\nespintcp_close() could lead to leaks, if esp_output_tcp_finish()\nre-adds an skb in the slot we just freed. After this, the existing\nbarrier() is no longer needed.",
  "id": "CVE-2026-80848",
  "modified": "2026-09-06T03:30:19.554491123Z",
  "published": "2026-09-04T15:54:58.427Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80848.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80848"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "xfrm: espintcp: fix UAF during close"
}