Kernel heap disclosure via unbounded device response
Published Sep 4, 2026 · Updated Sep 4, 2026
Out-of-bounds read in Linux kernel virtio crypto code introduced in 5.19 allows attackers to expose adjacent kernel heap data. The virtio_crypto_dataq_akcipher_callback function trusts a device-reported result length, and sg_copy_from_buffer reads that amount from a buffer sized only for the request. Exploitation requires a nonconforming or attacker-controlled virtio crypto backend to return an oversized length, exposing adjacent heap bytes through the caller's scatterlist.
Summary
What happened
Out-of-bounds read in Linux kernel virtio crypto code introduced in 5.19 allows attackers to expose adjacent kernel heap data. The virtio_crypto_dataq_akcipher_callback function trusts a device-reported result length, and sg_copy_from_buffer reads that amount from a buffer sized only for the request. Exploitation requires a nonconforming or attacker-controlled virtio crypto backend to return an oversized length, exposing adjacent heap bytes through the caller's scatterlist.
The record
- CVE
- CVE-2026-80836
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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=5.19
- Affected versionversion=a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a <1f9f877b1ef1fbd4ee95571cddf39c8002cee252
- Affected versionversion=a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a <3fda114a42f1510a4ec8a0b17a0cfc997952ccc2
- Affected versionversion=a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a <5545de5050cbc3594506d74f2c392b0716cf8bca
- Affected versionversion=a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a <f77a956f6a19f9463ef1527c9d0cda50dded6b92
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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