Guest daemon crash via wrapped buffer allocation
Published Jun 29, 2026 · Updated Jun 29, 2026
Integer overflow in spice-vdagent on Red Hat Enterprise Linux allows attackers controlling a SPICE host to crash the guest daemon. udscs_write stores sizeof(header) plus the untrusted message size in a 32-bit guint, allocates the wrapped result, then copies the original size into the undersized heap buffer. Exploitation requires a malicious or compromised virtualization host; the supported impact is interruption of the spice-vdagent daemon in the guest.
Summary
What happened
Integer overflow in spice-vdagent on Red Hat Enterprise Linux allows attackers controlling a SPICE host to crash the guest daemon. udscs_write stores sizeof(header) plus the untrusted message size in a 32-bit guint, allocates the wrapped result, then copies the original size into the undersized heap buffer. Exploitation requires a malicious or compromised virtualization host; the supported impact is interruption of the spice-vdagent daemon in the guest.
The record
- CVE
- CVE-2026-57965
- Published
- Jun 29, 2026
- Updated
- Jun 29, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-190, T1499
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 29, 2026CVE publishedPublication date reported by the CVE source.
- Jun 29, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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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