xfs: don't livelock in scrub on a circular unlinked list

{
  "id": "8cf8a9a3c453b3e3c4ea0428004cf33591a258970f8b55432e921016c6d32cf3",
  "url": "https://osv.dev/vulnerability/CVE-2026-80820",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfs: don't livelock in scrub on a circular unlinked list",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfs: don't livelock in scrub on a circular unlinked list LOLLM points out that online fsck can livelock if an unlinked inode list contains a loop. Use a bitmap to detect cycles.",
    "evidence": "osv:CVE-2026-80820",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.106",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80820",
      "aliases": [
        "CVE-2026-80820"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "a12890aebb895951720ff884eab1c99a30645b29"
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                {
                  "fixed": "599453f83458b57995290a1d31200c263e2c2691"
                },
                {
                  "fixed": "159d162fe80bd56573cafde5801bd5a90a3dd1ac"
                },
                {
                  "fixed": "56407a61a8bb85b884de802d39635abdb0ea7408"
                },
                {
                  "fixed": "527eaaefddb6ec5c83a06c9a1559960dd6361753"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80820.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.15.0"
                },
                {
                  "fixed": "6.12.106"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.47"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80820.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.745324178Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/159d162fe80bd56573cafde5801bd5a90a3dd1ac",
        "https://git.kernel.org/stable/c/527eaaefddb6ec5c83a06c9a1559960dd6361753",
        "https://git.kernel.org/stable/c/56407a61a8bb85b884de802d39635abdb0ea7408",
        "https://git.kernel.org/stable/c/599453f83458b57995290a1d31200c263e2c2691",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80820.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80820",
        "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/2026/80xxx/CVE-2026-80820.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80820",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 502108,
  "published_at": "2026-09-04T15:13:41.355+00:00"
}