GHSA-M2J4-9JH2-F83W
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
btrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data()
In that function, we round down the start position and round up the ending position.
But during the calculation of @len, we use "round_up(start + len, sectorsize)", which is the rounded up end position, not the rounded up length.
Which results a much larger length, and later we are still using "start + len", which is completely incorrect.
Fix it by declaring a local @aligned_start and @aligned_len and use them instead.
{
"affected": [],
"aliases": [
"CVE-2026-90259"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:22Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data()\n\nIn that function, we round down the start position and round up the\nending position.\n\nBut during the calculation of @len, we use \"round_up(start + len,\nsectorsize)\", which is the rounded up end position, not the rounded up\nlength.\n\nWhich results a much larger length, and later we are still using\n\"start + len\", which is completely incorrect.\n\nFix it by declaring a local @aligned_start and @aligned_len and use them\ninstead.",
"id": "GHSA-m2j4-9jh2-f83w",
"modified": "2026-09-17T18:31:58Z",
"published": "2026-09-17T18:31:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90259"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9102b179512e11644fb0489ae62010a09afa199c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c4c136555ff90f1e2921cc42da43daac0ef9985e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e6edde29990af8064b9d12217ec03db231ccd55d"
}
],
"schema_version": "1.4.0",
"severity": []
}
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