Local privilege escalation via VDUSE offset underflow
Published Jun 19, 2024 · Updated Aug 5, 2026
Out-of-bounds write in Linux 5.15 through 5.15.10 allows local users to corrupt kernel memory through a crafted VDUSE ioctl. In vduse_dev_ioctl(), an unchecked config.offset larger than dev->config_size underflows an unsigned subtraction and gives copy_from_user an oversized length. Access to a VDUSE device descriptor is required; successful exploitation grants kernel-level privileges, while unsuccessful attempts can crash the host.
Summary
What happened
Out-of-bounds write in Linux 5.15 through 5.15.10 allows local users to corrupt kernel memory through a crafted VDUSE ioctl. In vduse_dev_ioctl(), an unchecked config.offset larger than dev->config_size underflows an unsigned subtraction and gives copy_from_user an oversized length. Access to a VDUSE device descriptor is required; successful exploitation grants kernel-level privileges, while unsuccessful attempts can crash the host.
The record
- CVE
- CVE-2021-47605
- Published
- Jun 19, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 19, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=5.15
- Affected versionversion=c8a6153b6c59d95c0e091f053f6f180952ade91e <e6c67560b4341914bec32ec536e931c22062af65
- Affected versionversion=c8a6153b6c59d95c0e091f053f6f180952ade91e <ff9f9c6e74848170fcb45c8403c80d661484c8c9
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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Public exploit references
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Technologies
Your stack
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Your stack
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