What is CVE-2026-31536?

CVE-2026-31536 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 5.15 onward and patched in 6.18.11, 6.19.1 and 7.0. CVE-2026-31536 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31536?

CVE-2026-31536 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31536?

Yes, CVE-2026-31536 has been patched. Fixed versions include 6.18.11, 6.19.1 and 7.0. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31536 actively exploited?

CVE-2026-31536 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31536

Critical

In the Linux kernel, the following vulnerability has been resolved: smb: server: let send_done handle a completion without IB_SEND_SIGNALED With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set. If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.15 and later are affected. Fixed in 6.18.11, 6.19.1, 7.0 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 6.18.11 6.18.x ✓ 6.19.1 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31536 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/24082642654f3e5149913946e89c00a297a8868f
Patch
Kernel patch commit
https://git.kernel.org/stable/c/9da82dc73cb03e85d716a2609364572367a5ff47
Patch
Kernel patch commit
https://git.kernel.org/stable/c/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3
Patch

Details

CVE ID CVE-2026-31536

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-04-24

Modified 2026-04-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31536?

CVE-2026-31536 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 5.15 onward and has been patched in 6.18.11, 6.19.1 and 7.0. CVE-2026-31536 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31536?

CVE-2026-31536 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31536?

Yes — CVE-2026-31536 has been patched. Fixed versions include 6.18.11, 6.19.1 and 7.0. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31536 actively exploited?

No — CVE-2026-31536 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.