What is CVE-2026-90038?

CVE-2026-90038 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 7.2 onward and patched in 7.2.5 and 7.3-rc1. CVE-2026-90038 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-90038?

CVE-2026-90038 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-2026-90038?

Yes, CVE-2026-90038 has been patched. Fixed versions include 7.2.5 and 7.3-rc1. If you are running Linux kernel 7.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-90038 actively exploited?

CVE-2026-90038 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-90038

Critical

In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during export state revocation nfsd4_revoke_export_states() has the same use-after-free as nfsd4_revoke_states(): it drops nn->client_lock across revoke_one_stid() and the following read of clp->cl_minorversion, but the stateid reference it holds does not pin the client. A teardown racing the dropped lock can free the client while revoke_one_stid() still dereferences it. exportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an administrator removing an export can race a client expiry. Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().

Package Linux Kernel

Published 2026-09-16

Last modified 2026-09-16

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 7.2 and later are affected. Fixed in 7.2.5, 7.3-rc1 and their respective stable series.

Affected from

≥ 7.2

Fixed in

✓ 7.2.5 7.2.x ✓ 7.3-rc1

References

2 total

Details

CVE ID CVE-2026-90038

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-09-16

Modified 2026-09-16

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-90038?

CVE-2026-90038 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 7.2 onward and has been patched in 7.2.5 and 7.3-rc1. CVE-2026-90038 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-90038?

CVE-2026-90038 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-2026-90038?

Yes. CVE-2026-90038 has been patched. Fixed versions include 7.2.5 and 7.3-rc1. If you are running Linux kernel 7.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-90038 actively exploited?

No. CVE-2026-90038 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.