In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an… (CVE-2026-64256)
A vulnerability in the Linux kernel's XFS filesystem quota handling was resolved. The issue involved the q_id variable, which is a 32-bit unsigned integer that could wrap around when reaching its maximum value, causing iteration over quota IDs to restart incorrectly. This was fixed by casting the variable to a 64-bit unsigned integer to prevent wraparound.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's XFS quota subsystem was due to the q_id variable being an unsigned 32-bit integer. When q_id reached the maximum value defined by XFS_DQ_ID_MAX, an addition operation caused it to wrap around to zero, restarting the iteration over quota IDs incorrectly. This could lead to improper quota management or iteration logic errors. The fix involved casting q_id to a 64-bit unsigned integer (u64) to prevent this wraparound behavior.
Potential Impact
The vulnerability could cause the quota ID iteration to restart prematurely due to integer wraparound, potentially leading to incorrect quota enforcement or filesystem quota inconsistencies. No known exploits in the wild have been reported. The impact is limited to quota ID iteration logic within the XFS filesystem in the Linux kernel.
Mitigation Recommendations
A fix has been implemented in the Linux kernel source code by casting the q_id variable to a 64-bit unsigned integer to prevent wraparound. Since this is a kernel-level fix, users should apply the official Linux kernel updates that include this patch once available. Patch status is not yet confirmed from vendor advisory; check the official Linux kernel release notes or advisories for the patch availability and apply updates accordingly.
In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an… (CVE-2026-64256)
Description
A vulnerability in the Linux kernel's XFS filesystem quota handling was resolved. The issue involved the q_id variable, which is a 32-bit unsigned integer that could wrap around when reaching its maximum value, causing iteration over quota IDs to restart incorrectly. This was fixed by casting the variable to a 64-bit unsigned integer to prevent wraparound.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's XFS quota subsystem was due to the q_id variable being an unsigned 32-bit integer. When q_id reached the maximum value defined by XFS_DQ_ID_MAX, an addition operation caused it to wrap around to zero, restarting the iteration over quota IDs incorrectly. This could lead to improper quota management or iteration logic errors. The fix involved casting q_id to a 64-bit unsigned integer (u64) to prevent this wraparound behavior.
Potential Impact
The vulnerability could cause the quota ID iteration to restart prematurely due to integer wraparound, potentially leading to incorrect quota enforcement or filesystem quota inconsistencies. No known exploits in the wild have been reported. The impact is limited to quota ID iteration logic within the XFS filesystem in the Linux kernel.
Mitigation Recommendations
A fix has been implemented in the Linux kernel source code by casting the q_id variable to a 64-bit unsigned integer to prevent wraparound. Since this is a kernel-level fix, users should apply the official Linux kernel updates that include this patch once available. Patch status is not yet confirmed from vendor advisory; check the official Linux kernel release notes or advisories for the patch availability and apply updates accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-wr2h-54m4-vp72
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64256"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420f9c2644c7f8086c32
Added to database: 07/25/2026, 23:09:03 UTC
Last enriched: 07/25/2026, 23:43:17 UTC
Last updated: 07/26/2026, 03:44:09 UTC
Views: 4
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