CVE-2026-64306

crypto: drbg - Fix returning success on failure in CTR_DRBG

MEDIUM

5.5

CVSS Score

Published: July 25, 2026 at 08:49 AM UTC

Updated: October 24, 2026 at 01:10 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.12.44 ≤ v < 3.134.1 ≤ v < 5.10.2615.11 ≤ v < 5.15.2125.16 ≤ v < 6.1.1786.13 ≤ v < 6.18.396.19 ≤ v < 7.1.46.2 ≤ v < 6.6.1456.7 ≤ v < 6.12.963.12.44 4.1cde001e4c3c3625c60b68a83eb1f1c2572dee07af60b0fa8bbddde66f1d197be07120264b555c84a

Vendor states this is fixed in 074db6db03a0aaa78f05ca9d4838053713796665 (fixed)

Vendor states this is fixed in 23b8b188cb32e5531d0f8d3af9506f8959cb369e (fixed)

Vendor states this is fixed in 39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b (fixed)

Vendor states this is fixed in 75597e8774f319152744d24e0683d9393540a951 (fixed)

Vendor states this is fixed in 7b03312491f9fe6ba4d60c4023e7e61d2d1fed96 (fixed)

Vendor states this is fixed in a9e886f73dd717027028bb7e3bbca93601ecdfc7 (fixed)

Vendor states this is fixed in bbbac12083eff489b35d848332f0dff311131344 (fixed)

Vendor states this is fixed in cc42fb40171c249bb859071d81b4eb007398a0bc (fixed)

Affected range stops below 3.13, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 4.1 (unaffected)

Vendor states this is fixed in 5.10.261 (unaffected)

Vendor states this is fixed in 5.15.212 (unaffected)