mptcp: Fix crash due to tcp_tsorted_anchor was initialized before release skb

{
  "id": "95d6f8bcf86507879bd141bfd3c81efda5a8fc20ce04a1f2664c30a4e3a51a53",
  "url": "https://osv.dev/vulnerability/CVE-2022-49198",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: Fix crash due to tcp_tsorted_anchor was initialized before release skb",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mptcp: Fix crash due to tcp_tsorted_anchor was initialized before release skb Got crash when doing pressure test of mptcp: =========================================================================== dst_release: dst:ffffa06ce6e5c058 refcnt:-1 kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle kernel paging request at ffffa06ce6e5c058 PGD 190a01067 P4D 190a01067 PUD 43fffb067 PMD 22e403063 PTE 8000000226e5c063 Oops: 0011 [#1] SMP PTI CPU: 7 PID: 7823 Comm: kworker/7:0 Kdump: loaded Tainted: G E Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.2.1 04/01/2014 Call Trace: ? skb_release_head_state+0x68/0x100 ? skb_release_all+0xe/0x30 ? kfree_skb+0x32/0xa0 ? mptcp_sendmsg_frag+0x57e/0x750 ? __mptcp_retrans+0x21b/0x3c0 ? __switch_to_asm+0x35/0x70 ? mptcp_worker+0x25e/0x320 ? process_one_work+0x1a7/0x360 ? worker_thread+0x30/0x390 ? create_worker+0x1a0/0x1a0 ? kthread+0x112/0x130 ? kthread_flush_work_fn+0x10/0x10 ? ret_from_fork+0x35/0x40 =========================================================================== In __mptcp_alloc_tx_skb skb was allocated and skb->tcp_tsorted_anchor will be initialized, in under memory pressure situation sk_wmem_schedule will return false and then kfree_skb. In this case skb->_skb_refdst is not null because_skb_refdst and tcp_tsorted_anchor are stored in the same mem, and kfree_skb will try to release dst and cause crash.",
    "evidence": "osv:CVE-2022-49198",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.16.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49198",
      "aliases": [
        "CVE-2022-49198"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "289f2f58266777f45a52cd55dea96d736e6244c9"
                },
                {
                  "fixed": "af61a8f7603926c26158153d0a0755764d82657c"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f70cad1085d1e01d3ec73c1078405f906237feee"
                },
                {
                  "fixed": "752add6f5ce5305e55d8bda4ac8d69be3a09f14d"
                },
                {
                  "fixed": "4d54181eba4b077fb74033a7186898ad4000a7a5"
                },
                {
                  "fixed": "3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49198.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.16.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "5.17.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49198.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.399276244Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3ef3905aa3b5b3e222ee6eb0210bfd999417a8cc",
        "https://git.kernel.org/stable/c/4d54181eba4b077fb74033a7186898ad4000a7a5",
        "https://git.kernel.org/stable/c/752add6f5ce5305e55d8bda4ac8d69be3a09f14d",
        "https://git.kernel.org/stable/c/af61a8f7603926c26158153d0a0755764d82657c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49198.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49198",
        "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/2022/49xxx/CVE-2022-49198.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49198",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492683,
  "published_at": "2025-02-26T01:55:41.631+00:00"
}