CVE-2026-53016 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability. The vulnerability has a high CVSS score of 7.8, indicating a significant risk. Users and administrators of Linux-based systems should review their systems for exposure and apply patches or mitigations as necessary.

Technical summary

The vulnerability is in the crypto: ccp - copy IV using skcipher ivsize component of the Linux kernel. The vulnerability occurs because ccp_aes_complete() restores AES_BLOCK_SIZE bytes into the caller's IV buffer, which overruns the provided buffer for RFC3686 skciphers that expose an 8-byte IV. To fix this, use crypto_skcipher_ivsize() to copy only the algorithm's IV length. This ensures that the IV is copied correctly, preventing buffer overruns.

Defensive priority

High priority should be given to patching or mitigating this vulnerability due to its high CVSS score of 7.8. Linux kernel users and administrators should review their systems for exposure and apply patches or mitigations as necessary.

Recommended defensive actions

• Review Linux kernel versions for exposure to CVE-2026-53016
• Apply patches or updates to affected Linux kernel versions
• Use crypto_skcipher_ivsize() to copy only the algorithm's IV length in crypto: ccp
• Monitor Linux kernel systems for potential exploitation attempts
• Implement compensating controls to mitigate potential impact

Evidence notes

The CVE-2026-53016 vulnerability has been resolved in the Linux kernel. The vulnerability is related to the crypto: ccp - copy IV using skcipher ivsize. The CVE was published on 2026-06-24T17:17:12.893Z and modified on 2026-06-28T08:16:29.720Z. The CVSS score is 7.8, indicating a high severity vulnerability.

Official resources