Module-loading hang via oversized virtio-fs bounce buffer
Published Dec 27, 2024 · Updated May 11, 2026
Denial of service in the Linux kernel virtio-fs driver allows local users to hang kernel module loading through uncached direct I/O. The virtio_fs_enqueue_req path copies an unsplit, vmalloc-backed KVEC_IO request into one kmalloc bounce buffer, so a roughly 10 MB read exceeds MAX_PAGE_ORDER and every retry fails. Triggering it requires permission to load a large module from a cache-disabled virtio-fs mount; the affected finit_module call then hangs indefinitely.
Summary
What happened
Denial of service in the Linux kernel virtio-fs driver allows local users to hang kernel module loading through uncached direct I/O. The virtio_fs_enqueue_req path copies an unsplit, vmalloc-backed KVEC_IO request into one kmalloc bounce buffer, so a roughly 10 MB read exceeds MAX_PAGE_ORDER and every retry fails. Triggering it requires permission to load a large module from a cache-disabled virtio-fs mount; the affected finit_module call then hangs indefinitely.
The record
- CVE
- CVE-2024-53219
- Published
- Dec 27, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 27, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.4
- Affected versionversion=a62a8ef9d97da23762a588592c8b8eb50a8deb6a <2bc07714dc955a91d2923a440ea02c3cb3376b10
- Affected versionversion=a62a8ef9d97da23762a588592c8b8eb50a8deb6a <41748675c0bf252b3c5f600a95830f0936d366c1
- Affected versionversion=a62a8ef9d97da23762a588592c8b8eb50a8deb6a <9a8fde56d4b6d51930936ed50f6370a9097328d1
What conditions does exploitation require?
What is affected?
Attacks
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Weakness, pattern, technique
Public exploit references
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