Host-memory disclosure via uncleared resource allocation
Published Aug 26, 2022 · Updated Aug 2, 2024
Information disclosure in Virglrenderer Project virglrenderer allows guest OS users to read uninitialized host memory through guest mmap. The vrend_resource_alloc_buffer function allocates res->ptr with malloc but does not clear it before VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING maps the resource. Exploitation requires control of guest userspace; it discloses residual host-memory contents without reported write access or service interruption.
Summary
What happened
Information disclosure in Virglrenderer Project virglrenderer allows guest OS users to read uninitialized host memory through guest mmap. The vrend_resource_alloc_buffer function allocates res->ptr with malloc but does not clear it before VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING maps the resource. Exploitation requires control of guest userspace; it discloses residual host-memory contents without reported write access or service interruption.
The record
- CVE
- CVE-2022-0175
- Published
- Aug 26, 2022
- Updated
- Aug 2, 2024
- Vendor
- Virglrenderer Project
- Product
- virglrenderer
- Classifications
- CWE-665, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2022CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record 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=Affects v0.9.0 and later.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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