What is CVE-2026-31663?

CVE-2026-31663 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 3.2.100 onward and patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31663 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31663?

CVE-2026-31663 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31663?

Yes, CVE-2026-31663 has been patched. Fixed versions include 6.18.23, 6.19.13 and 7.0. If you are running Linux kernel 3.2.100 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31663 actively exploited?

CVE-2026-31663 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31663

High

In the Linux kernel, the following vulnerability has been resolved: xfrm: hold dev ref until after transport_finish NF_HOOK After async crypto completes, xfrm_input_resume() calls dev_put() immediately on re-entry before the skb reaches transport_finish. The skb->dev pointer is then used inside NF_HOOK and its okfn, which can race with device teardown. Remove the dev_put from the async resumption entry and instead drop the reference after the NF_HOOK call in transport_finish, using a saved device pointer since NF_HOOK may consume the skb. This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip the okfn. For non-transport exits (decaps, gro, drop) and secondary async return points, release the reference inline when async is set.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-27

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 3.2.100, 3.16.55, 4.14.24, 4.15 and later are affected. Fixed in 6.18.23, 6.19.13, 7.0 and their respective stable series.

Affected from

≥ 3.2.100 ≥ 3.16.55 ≥ 4.14.24 ≥ 4.15

Fixed in

✓ 6.18.23 6.18.x ✓ 6.19.13 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31663 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
Patch
Kernel patch commit
https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2
Patch

Details

CVE ID CVE-2026-31663

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-04-24

Modified 2026-04-27

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31663?

CVE-2026-31663 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 3.2.100 onward and has been patched in 6.18.23, 6.19.13 and 7.0. CVE-2026-31663 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31663?

CVE-2026-31663 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31663?

Yes — CVE-2026-31663 has been patched. Fixed versions include 6.18.23, 6.19.13 and 7.0. If you are running Linux kernel 3.2.100 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31663 actively exploited?

No — CVE-2026-31663 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.