Guest memory disclosure or crash via oversized frame
Published Jul 25, 2025 · Updated Aug 5, 2026
Out-of-bounds access in affected Linux kernel releases allows attackers controlling a virtio backend to read guest memory or crash it. The virtio-net AF_XDP receive path lets buf_to_xdp validate the first buffer against the frame size plus vi->hdr_len, extending data_end beyond the allocated XSK chunk. Exploitation requires an AF_XDP zero-copy pool and an untrusted hypervisor, vDPA or VDUSE backend, or virtio offload device; remote network peers cannot trigger it.
Summary
What happened
Out-of-bounds access in affected Linux kernel releases allows attackers controlling a virtio backend to read guest memory or crash it. The virtio-net AF_XDP receive path lets buf_to_xdp validate the first buffer against the frame size plus vi->hdr_len, extending data_end beyond the allocated XSK chunk. Exploitation requires an AF_XDP zero-copy pool and an untrusted hypervisor, vDPA or VDUSE backend, or virtio offload device; remote network peers cannot trigger it.
The record
- CVE
- CVE-2025-38413
- Published
- Jul 25, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2025CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.11
- Affected versionversion=a4e7ba7027012f009f22a68bcfde670f9298d3a4 <5177373c31318c3c6a190383bfd232e6cf565c36
- Affected versionversion=a4e7ba7027012f009f22a68bcfde670f9298d3a4 <6013bb6bc24c2cac3f45b37a15b71b232a5b00ff
- Affected versionversion=a4e7ba7027012f009f22a68bcfde670f9298d3a4 <892f6ed9a4a38bb3360fdff091b9241cfa105b61
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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