Guest memory corruption via unchecked control metadata
Published Jul 25, 2026 · Updated Jul 25, 2026
Out-of-bounds access in the Linux Kernel virtio-snd driver allows attackers controlling its device backend to read or overwrite guest memory. virtsnd_kctl_info indexes a type map, while virtsnd_kctl_get and virtsnd_kctl_put size loops and copies, using unvalidated device-supplied type and count values against fixed-size arrays. Exploitation requires control of a locally attached virtio-snd backend; no routable network path or guest authentication is required.
Summary
What happened
Out-of-bounds access in the Linux Kernel virtio-snd driver allows attackers controlling its device backend to read or overwrite guest memory. virtsnd_kctl_info indexes a type map, while virtsnd_kctl_get and virtsnd_kctl_put size loops and copies, using unvalidated device-supplied type and count values against fixed-size arrays. Exploitation requires control of a locally attached virtio-snd backend; no routable network path or guest authentication is required.
The record
- CVE
- CVE-2026-64490
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 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=6.9
- Affected versionversion=d6568e3de42dd971a1356f7ba581e6600d53f0a0 <21584672fd699abe1768241d6c501b2de6139b6a
- Affected versionversion=d6568e3de42dd971a1356f7ba581e6600d53f0a0 <3243563f99ef5d3949b934bd6390a5679405d0e1
- Affected versionversion=d6568e3de42dd971a1356f7ba581e6600d53f0a0 <5da9742de22db0dbaa8d414214ab5e1bedde00f9
- Affected versionversion=d6568e3de42dd971a1356f7ba581e6600d53f0a0 <c77a6cbb36ff8cbc1f084d94f8dcda5250935271
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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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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