What is CVE-2026-31727?

CVE-2026-31727 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 6.12.78 onward and patched in 6.12.81, 6.18.22 and 6.19.12. CVE-2026-31727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31727?

CVE-2026-31727 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-2026-31727?

Yes, CVE-2026-31727 has been patched. Fixed versions include 6.12.81, 6.18.22 and 6.19.12. If you are running Linux kernel 6.12.78 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31727 actively exploited?

CVE-2026-31727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2026-31727

Medium

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix NULL pointer deref in eth_get_drvinfo Commit ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecycle with device_move") reparents the gadget device to /sys/devices/virtual during unbind, clearing the gadget pointer. If the userspace tool queries on the surviving interface during this detached window, this leads to a NULL pointer dereference. Unable to handle kernel NULL pointer dereference Call trace: eth_get_drvinfo+0x50/0x90 ethtool_get_drvinfo+0x5c/0x1f0 __dev_ethtool+0xaec/0x1fe0 dev_ethtool+0x134/0x2e0 dev_ioctl+0x338/0x560 Add a NULL check for dev->gadget in eth_get_drvinfo(). When detached, skip copying the fw_version and bus_info strings, which is natively handled by ethtool_get_drvinfo for empty strings.

Package Linux Kernel

Published 2026-05-01

Last modified 2026-06-19

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-476

CVE-2026-31727 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.12.78, 6.18.19, 6.19.9 and later are affected. Fixed in 6.12.81, 6.18.22, 6.19.12 and their respective stable series.

Affected from

≥ 6.12.78 ≥ 6.18.19 ≥ 6.19.9

Fixed in

✓ 6.12.81 6.12.x ✓ 6.18.22 6.18.x ✓ 6.19.12 6.19.x

References

6 total

Kernel Git
https://git.kernel.org/stable/c/0326429e8ba99892e1d1e115dc8e88e1a3b64e24

Patch
Kernel Git
https://git.kernel.org/stable/c/7de4d46be40738c7e48e64b5cc0a34aa1e047b0a

Patch
Kernel Git
https://git.kernel.org/stable/c/a36e5e800b9c93e3e1ffa42f34d38b36775dbcee

Patch
Kernel Git
https://git.kernel.org/stable/c/e002e92e88e12457373ed096b18716d97e7bbb20

Patch
Kernel Git
https://git.kernel.org/stable/c/7fce959e9be3bf63bb0fdf4b05f9cc42cb289fe2

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-31727

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-01

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31727?

CVE-2026-31727 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 6.12.78 onward and has been patched in 6.12.81, 6.18.22 and 6.19.12. CVE-2026-31727 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31727?

CVE-2026-31727 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-2026-31727?

Yes. CVE-2026-31727 has been patched. Fixed versions include 6.12.81, 6.18.22 and 6.19.12. If you are running Linux kernel 6.12.78 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31727 actively exploited?

No. CVE-2026-31727 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.