GHSA-CCW7-243P-5699
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98279"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:17Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: handle lack of space when cleaning up verity items\n\nWhen enable_verity() hits the qgroup limit, rollback_verity() needs its\nown metadata reservation. When the qgroup limit or lack of space refuses\nthe rollback, the whole filesystem is forced read-only even though the\nqgroup limit was for one subvolume only. Also orphan cleanup at the next\nmount fails the same way, so the leftover items are never removed: with\n-EDQUOT the subvolume stays unreachable, and with -ENOSPC on a full\nfilesystem the next read-write mount fails.\n\nStart transactions with btrfs_start_transaction_fallback_global_rsv() in\nbtrfs_orphan_cleanup(), drop_verity_items() and rollback_verity(). Those\ncalls only delete items and free the space in the end, so they may use\nthe global reserve and skip the qgroup limit, which avoids -ENOSPC and\n-EDQUOT.",
"id": "GHSA-ccw7-243p-5699",
"modified": "2026-10-06T09:31:33Z",
"published": "2026-10-06T09:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98279"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b7ecabd87dc40998fe7870d7975279649229a3b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/76bf149cd0298544631e756670b89c399c7acbca"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/efa5780b84f066f419a667f6b9542368b2f62074"
}
],
"schema_version": "1.4.0",
"severity": []
}
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