What is CVE-2026-31535?

CVE-2026-31535 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10, affecting Linux kernel versions from 6.18 onward and patched in 6.18.11, 6.19.1 and 7.0. CVE-2026-31535 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31535?

CVE-2026-31535 has a CVSS score of 4.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-31535?

Yes, CVE-2026-31535 has been patched. Fixed versions include 6.18.11, 6.19.1 and 7.0. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31535 actively exploited?

CVE-2026-31535 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31535

Medium

In the Linux kernel, the following vulnerability has been resolved: smb: client: make use of smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted recv_io and granted credits is racy. That's because the peer might already consumed a credit, but between receiving the incoming recv at the hardware and processing the completion in the 'recv_done' functions we likely have a window where we grant credits, which don't really exist. So we better have a decicated counter for the available credits, which will be incremented when we posted new recv buffers and drained when we grant the credits to the peer.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

4.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-367

CVE-2026-31535 is classified as CWE-367

See CWE-367 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.11, 6.19.1, 7.0 and their respective stable series.

Affected from

≥ 6.18

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-2026-31535 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/9911b1ed187a770a43950bf51f340ad4b7beecba
Patch
Kernel patch commit
https://git.kernel.org/stable/c/be8845ad5d6558703d20567d8702155598325db8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/f664e6e8a81103cb45c8802a9bc7499e0902c458
Patch

Details

CVE ID CVE-2026-31535

Severity Medium

CVSS score 4.7 / 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-2026-31535?

CVE-2026-31535 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.11, 6.19.1 and 7.0. CVE-2026-31535 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31535?

CVE-2026-31535 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-31535?

Yes — CVE-2026-31535 has been patched. Fixed versions include 6.18.11, 6.19.1 and 7.0. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31535 actively exploited?

No — CVE-2026-31535 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.