What’s Vulnerable › Vulnerabilities

CVE-2026-64306: crypto: drbg - Fix returning success on failure in CTR_DRBG

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-10-24

Description

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.

Affected products

• Linux kernel: from 3.12.44 before 3.13; from 4.1 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96 — fixed in 3.13, 5.10.261, 5.15.212, 6.1.178, 6.12.96, 6.18.39

How to fix

Upgrade to a fixed version: Linux kernel 3.13, 5.10.261, 5.15.212, 6.1.178. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665
• https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e
• https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b
• https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951
• https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96
• https://git.kernel.org/stable/c/a9e886f73dd717027028bb7e3bbca93601ecdfc7
• https://git.kernel.org/stable/c/bbbac12083eff489b35d848332f0dff311131344
• https://git.kernel.org/stable/c/cc42fb40171c249bb859071d81b4eb007398a0bc

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