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VulnerabilityPublished Updated

CVE-2026-80836: Linux kernel · crypto: virtio – bound the akcipher result length

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f77a956f6a19f9463ef1527c9d0cda50dded6b92 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 13:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f77a956f6a19f9463ef1527c9d0cda50dded6b92, e0ffee8adc71a0bc548e5ebc6e021c013a874d79, bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78 +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < f77a956f6a19f9463ef1527c9d0cda50dded6b92
Fixed in
  • f77a956f6a19f9463ef1527c9d0cda50dded6b92
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < e0ffee8adc71a0bc548e5ebc6e021c013a874d79
Fixed in
  • e0ffee8adc71a0bc548e5ebc6e021c013a874d79
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78
Fixed in
  • bd33cb19bcb432a4dd5e8f50be5e2547af1e9f78
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < 5545de5050cbc3594506d74f2c392b0716cf8bca
Fixed in
  • 5545de5050cbc3594506d74f2c392b0716cf8bca
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < 12c4f29e97f31b013f77ad65ba7daeb02aaa6abe
Fixed in
  • 12c4f29e97f31b013f77ad65ba7daeb02aaa6abe
LinuxLinuxAffected
  • ≥ a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a, < 3fda114a42f1510a4ec8a0b17a0cfc997952ccc2
Fixed in
  • 3fda114a42f1510a4ec8a0b17a0cfc997952ccc2

AI-suggested

A fix is available and has been applied in the Linux kernel after version 5.19. Users and administrators should update to a patched kernel version that includes the fix identified by the listed commits. No additional mitigation is required beyond applying the official patch.

Description

CVE-2026-80836 is a vulnerability in the Linux kernel's virtio crypto driver where the akcipher result length was not properly bounded, leading to an out-of-bounds read of kernel heap memory. The flaw occurs because the device-reported response length could exceed the allocated destination buffer size, causing sg_copy_from_buffer() to read beyond the intended memory region. The issue has been fixed by clamping the reported length to the originally requested destination length, ensuring no over-read occurs. This fix does not affect valid results from conforming devices.

References

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