Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-25T00:00:00 kernel: smb: client: Fix next buffer leak in receive_encrypted_standard() 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-772

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.

A flaw was found in the SMB client of the Linux kernel. A remote attacker could exploit a memory leak in the `receive_encrypted_standard()` function by sending specially crafted compound Protocol Data Units (PDUs). This vulnerability occurs because a buffer is allocated before a necessary size check, leading to the buffer not being freed if the check fails. Repeated exploitation of this flaw could lead to a Denial of Service (DoS) due to memory exhaustion.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64381 https://nvd.nist.gov/vuln/detail/CVE-2026-64381 https://lore.kernel.org/linux-cve-announce/2026072525-CVE-2026-64381-5b4a@gregkh/T