btrfs: handle lack of space when cleaning up verity items

{
  "id": "f3bb0a0670382d733be8513189603c0adfabd49697faf93d5d7dc5862f2013ef",
  "url": "https://osv.dev/vulnerability/CVE-2026-98279",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: handle lack of space when cleaning up verity items",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: btrfs: handle lack of space when cleaning up verity items When enable_verity() hits the qgroup limit, rollback_verity() needs its own metadata reservation. When the qgroup limit or lack of space refuses the rollback, the whole filesystem is forced read-only even though the qgroup limit was for one subvolume only. Also orphan cleanup at the next mount fails the same way, so the leftover items are never removed: with -EDQUOT the subvolume stays unreachable, and with -ENOSPC on a full filesystem the next read-write mount fails. Start transactions with btrfs_start_transaction_fallback_global_rsv() in btrfs_orphan_cleanup(), drop_verity_items() and rollback_verity(). Those calls only delete items and free the space in the end, so they may use the global reserve and skip the qgroup limit, which avoids -ENOSPC and -EDQUOT.",
    "evidence": "osv:CVE-2026-98279",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98279",
      "aliases": [
        "CVE-2026-98279"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "146054090b0859b28fc39015c7704ccc3c3a347f"
                },
                {
                  "fixed": "4b7ecabd87dc40998fe7870d7975279649229a3b"
                },
                {
                  "fixed": "efa5780b84f066f419a667f6b9542368b2f62074"
                },
                {
                  "fixed": "76bf149cd0298544631e756670b89c399c7acbca"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98279.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.18.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98279.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.953767435Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b7ecabd87dc40998fe7870d7975279649229a3b",
        "https://git.kernel.org/stable/c/76bf149cd0298544631e756670b89c399c7acbca",
        "https://git.kernel.org/stable/c/efa5780b84f066f419a667f6b9542368b2f62074",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98279.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98279",
        "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-2026-98279.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98279",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494537,
  "published_at": "2026-10-06T08:45:39.114+00:00"
}