What is CVE-2026-64306?

CVE-2026-64306 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 3.12.44 onward and patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64306 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64306?

CVE-2026-64306 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-64306?

Yes, CVE-2026-64306 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 3.12.44 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64306 actively exploited?

CVE-2026-64306 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64306

Medium

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.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-09-03

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 3.12.44, 4.1 and later are affected. Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 and their respective stable series.

Affected from

≥ 3.12.44 ≥ 4.1

Fixed in

✓ 5.10.261 5.10.x ✓ 5.15.212 5.15.x ✓ 6.1.178 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2

References

8 total

Kernel Git
https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665

Patch
Kernel Git
https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e

Patch
Kernel Git
https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b

Patch
Kernel Git
https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951

Patch
Kernel Git
https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-64306

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-07-25

Modified 2026-09-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64306?

CVE-2026-64306 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 3.12.44 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64306 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64306?

CVE-2026-64306 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-64306?

Yes. CVE-2026-64306 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 3.12.44 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64306 actively exploited?

No. CVE-2026-64306 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.