CVE-2026-64306

mediumCVSS 5.5covered by 2 sourcesfirst seen 2026-07-25

In the Linux kernel, the following vulnerability has been resolved: crypto: drbg - Fix returning success on failure in CTR_DRBG drbg_ctr_generate() sometimes returns success when it fails, leaving the output buffer uninitialized. Fix it.

CSIRTS triage

What: The CTR_DRBG function incorrectly returns success on failure.
Who is affected: Deployments using the crypto subsystem.
Urgency: Remediation is necessary to ensure proper functionality, though no exploitation is reported.
Action: Apply the latest patches for the crypto subsystem.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.

Advisory coverage (2)

mediumCVE-2026-64306: crypto: drbg - Fix returning success on failure in CTR_DRBGmsrc · 2026-08-06
unknownCVE-2026-64306: In the Linux kernel, the following vulnerability has been resolved: crypto: drbg - Fix returni…nvd · 2026-07-25

External references

NVD record for CVE-2026-64306

CVE.org record

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