CVE-2026-23229: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: crypto: virtio - Add spinlock protection with virtqueue notification When VM boots with one virtio-crypto PCI device and builtin backend, run openssl benchmark command with multiple processes, such as openssl speed -evp aes-128-cbc -engine afalg -seconds 10 -multi 32 openssl processes will hangup and there is error reported like this: virtio_crypto virtio0: dataq.0:id 3 is not a head! It seems that the data virtqueue need protection when it is handled for virtio done notification. If the spinlock protection is added in virtcrypto_done_task(), openssl benchmark with multiple processes works well.

Affected products

• Linux Linux Kernel: from 4.19.306, before 4.20 (fixed in 4.20); from 5.4.268, before 5.5 (fixed in 5.5); from 5.10.209, before 5.10.251 (fixed in 5.10.251); from 5.15.148, before 5.15.201 (fixed in 5.15.201); from 6.1.75, before 6.1.164 (fixed in 6.1.164); from 6.6.14, before 6.6.125 (fixed in 6.6.125); …

Published 2026-02-18. Last modified 2026-06-17.