net/tls: Consume empty data records in tls_sw_read_sock()

{
  "id": "c773782ba2c1d960de419daa207f237d57eb21c633ac88ee9839fe1c98c2bc1c",
  "url": "https://osv.dev/vulnerability/CVE-2026-72330",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/tls: Consume empty data records in tls_sw_read_sock()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/tls: Consume empty data records in tls_sw_read_sock() A peer may send a zero-length TLS application_data record; TLS 1.3 explicitly permits these as a traffic-analysis countermeasure (RFC 8446, Section 5.1). After decryption such a record has full_len == 0. tls_sw_read_sock() hands it to the read_actor, which has no payload to consume and returns zero. The loop treats a zero return as backpressure (used <= 0), requeues the skb at the head of rx_list, and stops. rx_list is serviced head-first on the next call, so the empty record is dequeued, fails the same way, and is requeued again; every later record on the connection is blocked behind it. tls_sw_recvmsg() does not stall on this: a zero-length data record copies nothing and falls through to consume_skb(). Mirror that in the read_sock() path by recognizing an empty data record before the actor runs, consuming it, and continuing.",
    "evidence": "osv:CVE-2026-72330",
    "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": "high",
    "structured": {
      "id": "CVE-2026-72330",
      "aliases": [
        "CVE-2026-72330"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "662fbcec32f4af6bdcf5b4006b792ebe9543d945"
                },
                {
                  "fixed": "0867b0f2513ebc1c475af9898c97f4772a68d964"
                },
                {
                  "fixed": "c6b440cf766a557b08d25f1b571b3d57d039686e"
                },
                {
                  "fixed": "e8a4c9fc437b16aef38f86ce3275677e36924259"
                },
                {
                  "fixed": "ebc295ce343600c2d60c1e1e0c5d192080217457"
                },
                {
                  "fixed": "3be28e2c9cd0230cb51fd4967df095273afd3848"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72330.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.145"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                {
                  "fixed": "6.12.97"
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              "events": [
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                  "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-2026-72330.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.216760044Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0867b0f2513ebc1c475af9898c97f4772a68d964",
        "https://git.kernel.org/stable/c/3be28e2c9cd0230cb51fd4967df095273afd3848",
        "https://git.kernel.org/stable/c/c6b440cf766a557b08d25f1b571b3d57d039686e",
        "https://git.kernel.org/stable/c/e8a4c9fc437b16aef38f86ce3275677e36924259",
        "https://git.kernel.org/stable/c/ebc295ce343600c2d60c1e1e0c5d192080217457",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72330.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72330",
        "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-2026-72330.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72330",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518942,
  "published_at": "2026-08-15T05:55:40.555+00:00"
}