smb: client: delete compound mids on send failure before unlock

{
  "id": "23d5c8da139021e5dd93a461172b036f50a601869baecbe05ec2740ceb33d0b0",
  "url": "https://osv.dev/vulnerability/CVE-2026-98449",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "smb: client: delete compound mids on send failure before unlock",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: smb: client: delete compound mids on send failure before unlock When sending a compound request fails, smb_send_rqst() kicks off a reconnect. compound_send_recv() still has those mids on pending_mid_q, but it unlocks the server without removing them first. During reconnect, cifs_abort_connection() walks pending_mid_q and runs each mid callback. With no response yet, those callbacks return credits and drop in_flight. Then compound_send_recv()'s send-error path returns the same credits again. in_flight ends up decremented twice and smb2_add_credits() WARNs. syzbot hits this during SMB2_negotiate when the socket send fails. cifs_call_async() already calls delete_mid() before unlock on send failure. Do the same for compound chains and set cancelled_mid[] so the out: path does not delete them again.",
    "evidence": "osv:CVE-2026-98449",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98449",
      "aliases": [
        "CVE-2026-98449"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "ee258d79159afed52ca9372aeb9c1a51e89b32ee"
                },
                {
                  "fixed": "70783946f3b5d0c06ec7df0f5e7bec2bfad24efb"
                },
                {
                  "fixed": "8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4.20.11"
                },
                {
                  "fixed": "4.21"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3c57a0be487088b08d9c88998f911eb4a7ba36e4"
                }
              ]
            }
          ],
          "versions": [
            "v4.20.17",
            "v4.20.16",
            "v4.20.15",
            "v4.20.14",
            "v4.20.13",
            "v4.20.12",
            "v4.20.11"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98449.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.0.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98449.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.650518931Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/70783946f3b5d0c06ec7df0f5e7bec2bfad24efb",
        "https://git.kernel.org/stable/c/8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98449.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98449",
        "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/2026/98xxx/CVE-2026-98449.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98449",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507263,
  "published_at": "2026-10-18T15:14:59.772+00:00"
}