Resource leakage via skipped folio-batch cleanup
Published Sep 17, 2026 · Updated Sep 17, 2026
Resource leakage in Linux 6.19 iomap allows local users to retain kernel memory via filesystem callback errors during zero-range operations. In fs/iomap/iter.c, failed iomap_begin or iomap_end callbacks return without releasing the folio batch; XFS also omits iomap_flags on its error path. Reachability requires a callback failure after batch population, described as theoretical for XFS; the disclosure establishes unreleased resources, not a demonstrated hang, crash, or reboot.
Summary
What happened
Resource leakage in Linux 6.19 iomap allows local users to retain kernel memory via filesystem callback errors during zero-range operations. In fs/iomap/iter.c, failed iomap_begin or iomap_end callbacks return without releasing the folio batch; XFS also omits iomap_flags on its error path. Reachability requires a callback failure after batch population, described as theoretical for XFS; the disclosure establishes unreleased resources, not a demonstrated hang, crash, or reboot.
The record
- CVE
- CVE-2026-90384
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-772
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 17, 2026CVE publishedPublication date reported by the CVE source.
- Sep 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=395ed1ef0012e1bb1e4050e84ba0173b3623112a <31e3d833d522746a93d135e8b465d16f8ad33453
- Affected versionversion=395ed1ef0012e1bb1e4050e84ba0173b3623112a <34470cc3a8e66751030d7b777dd18d9f2acb48e8
- Affected versionversion=6.19
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
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