sunrpc: pin svc_xprt across the asynchronous TLS handshake callback

{
  "id": "d953f41a28e93121525c0cef1a65388606c309e5e6300233e88254433feaadeb",
  "url": "https://osv.dev/vulnerability/CVE-2026-72222",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sunrpc: pin svc_xprt across the asynchronous TLS handshake callback",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: sunrpc: pin svc_xprt across the asynchronous TLS handshake callback svc_tcp_handshake() stores the raw svc_xprt pointer in tls_handshake_args.ta_data and submits the request through tls_server_hello_x509(). The handshake core takes only sock_hold(req->hr_sk); nothing references the embedding struct svc_sock that svc_tcp_handshake_done() reaches via container_of(). Two close races leave the in-flight callback writing through a freed svc_sock. svc_sock_free() calls tls_handshake_cancel() and discards its return value: a false return means handshake_complete() has already set HANDSHAKE_F_REQ_COMPLETED but hp_done() may not have finished, yet svc_sock_free() proceeds to kfree(svsk). The cancel-loser fall-through inside svc_tcp_handshake() itself produces the same window: when wait_for_completion_interruptible_timeout() returns <= 0 (timeout or signal) and tls_handshake_cancel() returns false, the function does not drain, returns, and svc_handle_xprt() calls svc_xprt_received(), which clears XPT_BUSY and can drop the last reference. A concurrent close then runs svc_sock_free() while svc_tcp_handshake_done() is still updating xpt_flags and walking svsk->sk_handshake_done. The corruption surfaces as set_bit/clear_bit RMW into the freed xpt_flags slab slot and as complete_all() walking and writing the freed wait_queue_head_t list embedded in sk_handshake_done -- a slab-corruption primitive, not a benign read. The pat",
    "evidence": "osv:CVE-2026-72222",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.97",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-72222",
      "aliases": [
        "CVE-2026-72222"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b3cbf98e2fdf3cb147a95161560cd25987284330"
                },
                {
                  "fixed": "f3b55945dd99f29d83e1965d0141040a35262346"
                },
                {
                  "fixed": "2d4f97d13fff91e0bc539216be88b884b544d49f"
                },
                {
                  "fixed": "3f9ee75a97a769be258784c22b89657acb5ed9bd"
                },
                {
                  "fixed": "083e9c2ec7e8bb13b79c9fd7b337abdd758ecc5f"
                },
                {
                  "fixed": "4f988f3a2808fb659f3880c282041ff067acad78"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72222.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.145"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.97"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72222.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.486268298Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/083e9c2ec7e8bb13b79c9fd7b337abdd758ecc5f",
        "https://git.kernel.org/stable/c/2d4f97d13fff91e0bc539216be88b884b544d49f",
        "https://git.kernel.org/stable/c/3f9ee75a97a769be258784c22b89657acb5ed9bd",
        "https://git.kernel.org/stable/c/4f988f3a2808fb659f3880c282041ff067acad78",
        "https://git.kernel.org/stable/c/f3b55945dd99f29d83e1965d0141040a35262346",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72222.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72222",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72222.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72222",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492158,
  "published_at": "2026-08-15T05:54:15.277+00:00"
}