Host crash via wrapped VirtIO descriptor lengths
Published Oct 16, 2025 · Updated Oct 16, 2025
Out-of-bounds write in BitVisor from commit 108df6 before commit 480907 allows local users to crash the host via crafted VirtIO-net requests. In drivers/net/virtio_net.c, do_net_ctrl sums guest-controlled descriptor lengths in a 32-bit value, allocates the wrapped size, then copies each full descriptor into the undersized heap buffer. Exploitation requires a build with the optional virtio-net feature enabled and guest PCI access; the demonstrated outcome is a host hang, while code execution and guest escape remain unproven.
Summary
What happened
Out-of-bounds write in BitVisor from commit 108df6 before commit 480907 allows local users to crash the host via crafted VirtIO-net requests. In drivers/net/virtio_net.c, do_net_ctrl sums guest-controlled descriptor lengths in a 32-bit value, allocates the wrapped size, then copies each full descriptor into the undersized heap buffer. Exploitation requires a build with the optional virtio-net feature enabled and guest PCI access; the demonstrated outcome is a host hang, while code execution and guest escape remain unproven.
The record
- CVE
- CVE-2025-61553
- Published
- Oct 16, 2025
- Updated
- Oct 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122, CWE-787, T1499.004
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Oct 16, 2025CVE publishedPublication date reported by the CVE source.
- Oct 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Weakness, pattern, technique
Public exploit references
- CVE-2025-61553 guest-side proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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