{"id":"CVE-2026-90259","title":"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 …","summary":"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 …","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= bc42bda22345efdb5d8b578d1b4df2c6eaa85c58 < e6edde29990af8064b9d12217ec03db231ccd55d","Linux >= bc42bda22345efdb5d8b578d1b4df2c6eaa85c58 < c4c136555ff90f1e2921cc42da43daac0ef9985e","Linux >= bc42bda22345efdb5d8b578d1b4df2c6eaa85c58 < 9102b179512e11644fb0489ae62010a09afa199c","Linux 4.13"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:22.330","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90259","references":[{"url":"https://git.kernel.org/stable/c/9102b179512e11644fb0489ae62010a09afa199c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c4c136555ff90f1e2921cc42da43daac0ef9985e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e6edde29990af8064b9d12217ec03db231ccd55d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90259.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90259"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536356"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90259"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90259"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90259.mbox"},{"url":"https://git.kernel.org/stable/c/202ac9e469b78817512921c5db05cc2140e4ca43"},{"url":"https://git.kernel.org/stable/c/34adc843c28e5cd1f533a1d64f51b0f756fdf945"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.841Z","epss":0.00206,"epssPercentile":0.10582,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-787"],"slug":"CVE-2026-90259","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90259.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224334,"id":"CVE-2026-90259","ts":1792325091281,"field":"cvss","old":null,"new":"5.5"},{"seq":224333,"id":"CVE-2026-90259","ts":1792325091281,"field":"severity","old":"none","new":"medium"}]}