High 7.8Published Jul 25, 2026

CVE-2026-64381smb: client: Fix next buffer leak in receive_encrypted_standard()

Updated under an hour ago (Oct 26, 2026, 2:23 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 94e4f672db029414b9888b5137a7559f1febf2d8; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 68fc0b6cc03ca58060c0f36454e169f5fe258974; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 07e0ab81df1790afa35732a4e8e07ff831b29008; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 9136a08dc29328edd9867f2545e73906ac9df93b; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 67097772df7791c53d608f04bd31c676ccf79b83; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 297243e365fc9fe2f8e9b7dd535a65d922cd108b; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 927d4805aea0a287d36dd4f826ee24d69a2afee3; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 1c6267a1d5cf4c73b656f8181b310cbbb3e4767b	CNA record
linux linux_kernel linux:linux_kernel	from 4.19 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4	NVD

References

References

https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8	patch
https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974	patch
https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008	patch
https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b	patch
https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83	patch
https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b	patch
https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3	patch
https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.