scsi: qla2xxx: Fix soft lockup polling continuation IOCB signature

{
  "id": "739b453b9555043e0941ee329a9dee9450569900c3b943889cb88e537215ebd0",
  "url": "https://osv.dev/vulnerability/CVE-2026-97530",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "scsi: qla2xxx: Fix soft lockup polling continuation IOCB signature",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix soft lockup polling continuation IOCB signature qla27xx_copy_multiple_pkt() and qla27xx_copy_fpin_pkt() poll rsp_q->ring_ptr->signature for RESPONSE_PROCESSED (0xDEADDEAD) to decide whether the next continuation IOCB has arrived, spinning on cpu_relax() without advancing the ring or decrementing the entry count while it has not. response_t::signature lives at byte offset 60, but a continuation IOCB (sts_cont_entry_t / struct sts_cont_entry_ext) carries raw FC frame payload at that offset (data[56..59]). A received frame whose payload bytes happen to equal 0xDEADDEAD is therefore misread as \"not yet arrived\", and the loop spins forever in interrupt/DPC context, causing a CPU soft lockup. The poll is also unnecessary: callers of qla27xx_copy_multiple_pkt() (PT_LS4_UNSOL and the NVMe purls path) already gate on qla_chk_cont_iocb_avail(), which guarantees all entry_count IOCBs are present before copying begins. The sibling helper __qla_copy_purex_to_buffer() already drops the signature poll and relies on the entry_type == STATUS_CONT_TYPE guard instead. Remove the signature busy-wait from both helpers, keeping the entry_type guard, and gate the FPIN path with qla_chk_cont_iocb_avail() so it defers and re-processes on the next interrupt once all continuation IOCBs have arrived, mirroring the ELS_AUTH_ELS and PT_LS4_UNSOL arms. With this the signature field is never read on a continuation IOCB, e",
    "evidence": "osv:CVE-2026-97530",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-97530",
      "aliases": [
        "CVE-2026-97530"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9f2475fe7406b8ef5f97099c4980021344872d9f"
                },
                {
                  "fixed": "bded2de273c5b0e50e3e23de937260436cd67df2"
                },
                {
                  "fixed": "70df7f03499046da0d28a58ec8b237ed5dfbd0a7"
                },
                {
                  "fixed": "428e244dd4066abd40ca1ec525b7aab9a9db8296"
                },
                {
                  "fixed": "3e58eb888ebf265af937f636d05997c60d2f197c"
                },
                {
                  "fixed": "6e6c2ba9022eb8f9b062c81bdc6fd24c7b4c4c16"
                },
                {
                  "fixed": "6aa722fca9d2aa1f64094101587f8f4a2f83f6aa"
                },
                {
                  "fixed": "d7e3fa7d06bf7fcaac186d3c4d635caac166d36c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97530.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.9.0"
                },
                {
                  "fixed": "5.15.224"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.191"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97530.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:29.856888610Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3e58eb888ebf265af937f636d05997c60d2f197c",
        "https://git.kernel.org/stable/c/428e244dd4066abd40ca1ec525b7aab9a9db8296",
        "https://git.kernel.org/stable/c/6aa722fca9d2aa1f64094101587f8f4a2f83f6aa",
        "https://git.kernel.org/stable/c/6e6c2ba9022eb8f9b062c81bdc6fd24c7b4c4c16",
        "https://git.kernel.org/stable/c/70df7f03499046da0d28a58ec8b237ed5dfbd0a7",
        "https://git.kernel.org/stable/c/bded2de273c5b0e50e3e23de937260436cd67df2",
        "https://git.kernel.org/stable/c/d7e3fa7d06bf7fcaac186d3c4d635caac166d36c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97530.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97530",
        "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/2026/97xxx/CVE-2026-97530.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97530",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497753,
  "published_at": "2026-09-25T10:21:31.326+00:00"
}