---
id: CVE-2025-68295
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix memory leak in cifs_construct_tcon()

  When having a multiuser mount with domain= specified and using
  cifscreds, cifs_set_cifscreds() will end up settin…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: fix memory leak in cifs_construct_tcon()

  When having a multiuser mount with domain= specified and using
  cifscreds, cifs_set_cifscreds() will end up settin…
severity: none
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68295'
references:
  - url: 'https://git.kernel.org/stable/c/3184b6a5a24ec9ee74087b2a550476f386df7dc2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3dd546e867e94c2f954bca45a961b6104ba708b6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a67e91d5f446e455dd9201cdd6e865f7078d251d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d146e96fef876492979658dce644305de35878d4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f15288c137d960836277d0e3ecc62de68e52f00f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f62ffdfb431bdfa4b6d24233b7fd830eca0b801e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ff8f9bd1c46ee02d5558293915d42e82646d5ee9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00207
epssPercentile: 0.10009
ingestedAt: '2026-10-14T16:40:32.051Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix memory leak in cifs_construct_tcon()

When having a multiuser mount with domain= specified and using
cifscreds, cifs_set_cifscreds() will end up setting @ctx->domainname,
so it needs to be freed before leaving cifs_construct_tcon().

This fixes the following memory leak reported by kmemleak:

  mount.cifs //srv/share /mnt -o domain=ZELDA,multiuser,...
  su - testuser
  cifscreds add -d ZELDA -u testuser
  ...
  ls /mnt/1
  ...
  umount /mnt
  echo scan > /sys/kernel/debug/kmemleak
  cat /sys/kernel/debug/kmemleak
  unreferenced object 0xffff8881203c3f08 (size 8):
    comm "ls", pid 5060, jiffies 4307222943
    hex dump (first 8 bytes):
      5a 45 4c 44 41 00 cc cc                          ZELDA...
    backtrace (crc d109a8cf):
      __kmalloc_node_track_caller_noprof+0x572/0x710
      kstrdup+0x3a/0x70
      cifs_sb_tlink+0x1209/0x1770 [cifs]
      cifs_get_fattr+0xe1/0xf50 [cifs]
      cifs_get_inode_info+0xb5/0x240 [cifs]
      cifs_revalidate_dentry_attr+0x2d1/0x470 [cifs]
      cifs_getattr+0x28e/0x450 [cifs]
      vfs_getattr_nosec+0x126/0x180
      vfs_statx+0xf6/0x220
      do_statx+0xab/0x110
      __x64_sys_statx+0xd5/0x130
      do_syscall_64+0xbb/0x380
      entry_SYSCALL_64_after_hwframe+0x77/0x7f

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.