firewire: cdev: fix back-transition for iso_resource_auto client resource

{
  "id": "1428203d49fb8124f829a56b8c1ff76703db69ab999f291a309d6b6b5e16cdca",
  "url": "https://osv.dev/vulnerability/CVE-2026-98587",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firewire: cdev: fix back-transition for iso_resource_auto client resource",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firewire: cdev: fix back-transition for iso_resource_auto client resource The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order: ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC. Prevent the back-transition by checking the current state before updating it in the work item.",
    "evidence": "osv:CVE-2026-98587",
    "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-2026-98587",
      "aliases": [
        "CVE-2026-98587"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fcabbf40fae501379b4f3a057febe92d4b0ebdd8"
                },
                {
                  "fixed": "ee1df60a0d0e8ab4b00137135733bdadd6d33dab"
                },
                {
                  "fixed": "c6b51091cafff9ce6c03c1416aa13864d17ab97c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98587.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.2.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98587.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.942973520Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/c6b51091cafff9ce6c03c1416aa13864d17ab97c",
        "https://git.kernel.org/stable/c/ee1df60a0d0e8ab4b00137135733bdadd6d33dab",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98587.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98587",
        "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-2026-98587.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98587",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510992,
  "published_at": "2026-10-18T15:19:00.077+00:00"
}