What is CVE-2026-45939?

CVE-2026-45939 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 6.13 onward and patched in 6.18.14, 6.19.4 and 7.0. CVE-2026-45939 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45939?

CVE-2026-45939 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-2026-45939?

Yes, CVE-2026-45939 has been patched. Fixed versions include 6.18.14, 6.19.4 and 7.0. If you are running Linux kernel 6.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45939 actively exploited?

CVE-2026-45939 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2026-45939

Medium

In the Linux kernel, the following vulnerability has been resolved: gpib: Fix memory leak in ni_usb_init() In ni_usb_init(), if ni_usb_setup_init() fails, the function returns -EFAULT without freeing the allocated writes buffer, leading to a memory leak. Additionally, ni_usb_setup_init() returns 0 on failure, which causes ni_usb_init() to return -EFAULT, an inappropriate error code for this situation. Fix the leak by freeing writes in the error path. Modify ni_usb_setup_init() to return -EINVAL on failure and propagate this error code in ni_usb_init().

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-24

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

Weakness type

CWE-401

CVE-2026-45939 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.13 and later are affected. Fixed in 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 6.13

Fixed in

✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

3 total

Kernel Git
https://git.kernel.org/stable/c/9c97fcfb7a62dea893104a046d544da8ac23370b

Patch
Kernel Git
https://git.kernel.org/stable/c/b89921eed8cf2d97250bac4be38dbcfbf048b586

Patch
Kernel Git
https://git.kernel.org/stable/c/c899d4b62c0757a280831e89c1f3801b597e8f38

Patch

Details

CVE ID CVE-2026-45939

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45939?

CVE-2026-45939 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 6.13 onward and has been patched in 6.18.14, 6.19.4 and 7.0. CVE-2026-45939 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45939?

CVE-2026-45939 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-2026-45939?

Yes. CVE-2026-45939 has been patched. Fixed versions include 6.18.14, 6.19.4 and 7.0. If you are running Linux kernel 6.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45939 actively exploited?

No. CVE-2026-45939 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.