What is CVE-2026-64381?

CVE-2026-64381 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 4.19 onward and patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64381 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64381?

CVE-2026-64381 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64381?

Yes, CVE-2026-64381 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64381 actively exploited?

CVE-2026-64381 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64381

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-07-25

Patch available

Yes

Affected versions

Linux kernel versions 4.19 and later are affected. Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2-rc1 and their respective stable series.

Affected from

≥ 4.19

Fixed in

✓ 5.10.261 5.10.x ✓ 5.15.212 5.15.x ✓ 6.1.178 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2-rc1

References

8 total

Showing 5 of 8 references View all on NVD

Frequently asked questions

What is CVE-2026-64381?

CVE-2026-64381 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.19 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64381 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64381?

Yes. CVE-2026-64381 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64381 actively exploited?

No. CVE-2026-64381 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.