CVE-2026-64314 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux kernel versions 6.16 through 6.18.39 and 6.19 through 7.1.4 should assess exposure and verify patch deployment.

Why it matters

CVE-2026-64314 is a vulnerability in the Linux kernel's crypto: chacha20poly1305 that can cause crashes or errors if exploited. Linux kernel maintainers and users should assess exposure and verify patch deployment to prevent potential impacts.

• Verify patch deployment for affected Linux kernel versions to prevent potential crashes or errors
• Assess exposure of Linux kernel deployments to CVE-2026-64314 to prioritize patching
• Monitor Linux kernel updates for potential future vulnerabilities related to crypto: chacha20poly1305

Technical summary

The chachapoly_create() function in the Linux kernel's crypto: chacha20poly1305 accepts a compatibility poly1305 parameter in the template name but assumes the second template argument is always present. When the argument is missing, crypto_attr_alg_name() returns an error pointer. Check for that before comparing the name so malformed template instantiations fail with an error instead of dereferencing the error pointer in strcmp().

Defensive priority

Linux kernel maintainers and users should assess exposure and verify patch deployment.

Recommended defensive actions

• Assess exposure of Linux kernel deployments to CVE-2026-64314
• Verify patch deployment for affected Linux kernel versions
• Monitor Linux kernel updates for potential future vulnerabilities
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and patches. Linux kernel maintainers and users are advised to verify patch deployment. The vulnerability affects Linux kernel versions 6.16 through 6.18.39 and 6.19 through 7.1.4. The patches address the issue by validating the poly1305 template argument in the chachapoly_create() function. Evidence from the CVE record and NVD entry suggests that the vulnerability can cause crashes or errors if exploited. Defenders should verify patch deployment for affected Linux

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.