Kernel out-of-bounds read via mismatched virtqueue cookie
Published Sep 25, 2026 · Updated Sep 25, 2026
Out-of-bounds read in Linux virtio_console allows local users to access memory past a ports_device during device unbind. The remove_vqs() path passes a pending control-out cookie for &portdev->cpkt to free_buf(), which miscasts it as struct port_buffer and reads sgpages. Reachability requires a multiport virtio-console control message to remain on c_ovq while the device is unbound; the public record documents a KASAN slab-out-of-bounds report but no data disclosure or code execution.
Summary
What happened
Out-of-bounds read in Linux virtio_console allows local users to access memory past a ports_device during device unbind. The remove_vqs() path passes a pending control-out cookie for &portdev->cpkt to free_buf(), which miscasts it as struct port_buffer and reads sgpages. Reachability requires a multiport virtio-console control message to remain on c_ovq while the device is unbound; the public record documents a KASAN slab-out-of-bounds report but no data disclosure or code execution.
The record
- CVE
- CVE-2026-97995
- Published
- Sep 25, 2026
- Updated
- Sep 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 25, 2026CVE publishedPublication date reported by the CVE source.
- Sep 25, 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=3.16.60 <3.17
- Affected versionversion=3.18.108 <3.19
- Affected versionversion=4.14.39 <4.15
- Affected versionversion=4.1.52 <4.2
- Affected versionversion=4.16.7 <4.17
- Affected versionversion=4.17
- Affected versionversion=4.4.131 <4.5
- Affected versionversion=47cb14192bcbba3f15b1c3561e05e084e56fdef6
- Affected versionversion=4.9.98 <4.10
- Affected versionversion=6b1c41a0f7183702abb7a104c6c7e196ad69a6b3
- Affected versionversion=9037306163a6ba5587e4b5ca511ac7be4fb7295b
- Affected versionversion=a7a69ec0d8e4a58be7db88d33cbfa2912807bb2b <177ee901aa2bab02e7f1f8edbb814fd5e386ed62
- Affected versionversion=a7a69ec0d8e4a58be7db88d33cbfa2912807bb2b <894f98e73983f37354214a89a3a7fd35bf9e3072
- Affected versionversion=a7a69ec0d8e4a58be7db88d33cbfa2912807bb2b <a80c33488e0bbe642ed803b13a4ac8078a70b507
- Affected versionversion=a7a69ec0d8e4a58be7db88d33cbfa2912807bb2b <f620c40ea6862feed84deb105568b21ec53a7830
- Affected versionversion=a88e13d9a092fbb772d380944b44eb549ef131fe
- Affected versionversion=d2bbfac82b7942afc5d8e564d7087835280df495
- Affected versionversion=dd807a784fd36f4136516d5858efb6473dda422c
- Affected versionversion=f92b16b815efe8207090a9b5a767618fd89542ca
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
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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