What’s Vulnerable › Vulnerabilities

CVE-2026-80836: crypto: virtio - bound the akcipher result length

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: virtio - bound the akcipher result length virtio_crypto_dataq_akcipher_callback() sets the result length from the device-reported response length without bounding it to the destination buffer, which was allocated for the original request length. sg_copy_from_buffer() then reads that many bytes from the destination buffer; a backend reporting a larger length over-reads adjacent kernel heap into the caller's scatterlist (an out-of-bounds read). Clamp the reported length to the originally requested destination length. A conforming device reports no more than that, so valid results are unaffected.

Affected products

• Linux: 5.19 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12c4f29e97f31b013f77ad65ba7daeb02aaa6abe
• https://git.kernel.org/stable/c/1f9f877b1ef1fbd4ee95571cddf39c8002cee252
• https://git.kernel.org/stable/c/3fda114a42f1510a4ec8a0b17a0cfc997952ccc2
• https://git.kernel.org/stable/c/5545de5050cbc3594506d74f2c392b0716cf8bca
• https://git.kernel.org/stable/c/bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78
• https://git.kernel.org/stable/c/e0ffee8adc71a0bc548e5ebc6e021c013a874d79
• https://git.kernel.org/stable/c/f77a956f6a19f9463ef1527c9d0cda50dded6b92

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