CVE-2025-68295 (GCVE-0-2025-68295)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-06-16 16:54
VLAI
Title
smb: client: fix memory leak in cifs_construct_tcon()
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 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
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:54 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < ff8f9bd1c46ee02d5558293915d42e82646d5ee9 (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < d146e96fef876492979658dce644305de35878d4 (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < 3dd546e867e94c2f954bca45a961b6104ba708b6 (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < f62ffdfb431bdfa4b6d24233b7fd830eca0b801e (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < f15288c137d960836277d0e3ecc62de68e52f00f (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < a67e91d5f446e455dd9201cdd6e865f7078d251d (git)
Affected: f2aee329a68f5a907bcff11a109dfe17c0b41aeb , < 3184b6a5a24ec9ee74087b2a550476f386df7dc2 (git)
Affected: 1456d3cea31114137fabf1110d20a2e2c6d6060f (git)
Affected: 16764d7486d02b1699ae16e91d7a577602398b17 (git)
Affected: 904847402bd74a28164bd4d8da082d1eace7c190 (git)
Affected: 325fa2a6729b74b2806b31725940cb54658515e5 (git)
Affected: 8db988a982908b7bff76e095000adabf9c29698b (git)
Affected: 4.4.194 , < 4.5 (semver)
Affected: 4.9.194 , < 4.10 (semver)
Affected: 4.14.146 , < 4.15 (semver)
Affected: 4.19.75 , < 4.20 (semver)
Affected: 5.2.17 , < 5.3 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix memory leak in cifs_construct_tcon()\n\nWhen having a multiuser mount with domain= specified and using\ncifscreds, cifs_set_cifscreds() will end up setting @ctx-\u003edomainname,\nso it needs to be freed before leaving cifs_construct_tcon().\n\nThis fixes the following memory leak reported by kmemleak:\n\n  mount.cifs //srv/share /mnt -o domain=ZELDA,multiuser,...\n  su - testuser\n  cifscreds add -d ZELDA -u testuser\n  ...\n  ls /mnt/1\n  ...\n  umount /mnt\n  echo scan \u003e /sys/kernel/debug/kmemleak\n  cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff8881203c3f08 (size 8):\n    comm \"ls\", pid 5060, jiffies 4307222943\n    hex dump (first 8 bytes):\n      5a 45 4c 44 41 00 cc cc                          ZELDA...\n    backtrace (crc d109a8cf):\n      __kmalloc_node_track_caller_noprof+0x572/0x710\n      kstrdup+0x3a/0x70\n      cifs_sb_tlink+0x1209/0x1770 [cifs]\n      cifs_get_fattr+0xe1/0xf50 [cifs]\n      cifs_get_inode_info+0xb5/0x240 [cifs]\n      cifs_revalidate_dentry_attr+0x2d1/0x470 [cifs]\n      cifs_getattr+0x28e/0x450 [cifs]\n      vfs_getattr_nosec+0x126/0x180\n      vfs_statx+0xf6/0x220\n      do_statx+0xab/0x110\n      __x64_sys_statx+0xd5/0x130\n      do_syscall_64+0xbb/0x380\n      entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ff8f9bd1c46ee02d5558293915d42e82646d5ee9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d146e96fef876492979658dce644305de35878d4"
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          "url": "https://git.kernel.org/stable/c/3dd546e867e94c2f954bca45a961b6104ba708b6"
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      "title": "smb: client: fix memory leak in cifs_construct_tcon()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68295",
    "datePublished": "2025-12-16T15:06:14.977Z",
    "dateReserved": "2025-12-16T14:48:05.293Z",
    "dateUpdated": "2026-06-16T16:54:20.236Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-68295",
      "date": "2026-10-30",
      "epss": "0.00207",
      "percentile": "0.10814"
    },
    "microsoft_vex": {
      "current_release_date": "2026-01-07T14:39:44.000Z",
      "cve": "CVE-2025-68295",
      "id": "msrc_CVE-2025-68295",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: fix memory leak in cifs_construct_tcon()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-68295.json",
      "version": "2"
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                    "status": "unaffected",
                    "version": "6.17.11",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
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            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix memory leak in cifs_construct_tcon()\n\nWhen having a multiuser mount with domain= specified and using\ncifscreds, cifs_set_cifscreds() will end up setting @ctx-\u003edomainname,\nso it needs to be freed before leaving cifs_construct_tcon().\n\nThis fixes the following memory leak reported by kmemleak:\n\n  mount.cifs //srv/share /mnt -o domain=ZELDA,multiuser,...\n  su - testuser\n  cifscreds add -d ZELDA -u testuser\n  ...\n  ls /mnt/1\n  ...\n  umount /mnt\n  echo scan \u003e /sys/kernel/debug/kmemleak\n  cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff8881203c3f08 (size 8):\n    comm \"ls\", pid 5060, jiffies 4307222943\n    hex dump (first 8 bytes):\n      5a 45 4c 44 41 00 cc cc                          ZELDA...\n    backtrace (crc d109a8cf):\n      __kmalloc_node_track_caller_noprof+0x572/0x710\n      kstrdup+0x3a/0x70\n      cifs_sb_tlink+0x1209/0x1770 [cifs]\n      cifs_get_fattr+0xe1/0xf50 [cifs]\n      cifs_get_inode_info+0xb5/0x240 [cifs]\n      cifs_revalidate_dentry_attr+0x2d1/0x470 [cifs]\n      cifs_getattr+0x28e/0x450 [cifs]\n      vfs_getattr_nosec+0x126/0x180\n      vfs_statx+0xf6/0x220\n      do_statx+0xab/0x110\n      __x64_sys_statx+0xd5/0x130\n      do_syscall_64+0xbb/0x380\n      entry_SYSCALL_64_after_hwframe+0x77/0x7f"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: corrige la fuga de memoria en cifs_construct_tcon()\n\nCuando se tiene un montaje multiusuario con domain= especificado y usando cifscreds, cifs_set_cifscreds() terminar\u00e1 estableciendo @ctx -\u003e domainname, por lo que necesita ser liberado antes de salir de cifs_construct_tcon().\n\nEsto corrige la siguiente fuga de memoria reportada por kmemleak:\n\n  mount.cifs //srv/share /mnt -o domain=ZELDA,multiuser,...\n  su - testuser\n  cifscreds add -d ZELDA -u testuser\n  ...\n  ls /mnt/1\n  ...\n  umount /mnt\n  echo scan \u003e /sys/kernel/debug/kmemleak\n  cat /sys/kernel/debug/kmemleak\n  objeto sin referencia 0xffff8881203c3f08 (tama\u00f1o 8):\n    comm \u0027ls\u0027, pid 5060, jiffies 4307222943\n    volcado hexadecimal (primeros 8 bytes):\n      5a 45 4c 44 41 00 cc cc                          ZELDA...\n    rastreo (crc d109a8cf):\n      __kmalloc_node_track_caller_noprof+0x572/0x710\n      kstrdup+0x3a/0x70\n      cifs_sb_tlink+0x1209/0x1770 [cifs]\n      cifs_get_fattr+0xe1/0xf50 [cifs]\n      cifs_get_inode_info+0xb5/0x240 [cifs]\n      cifs_revalidate_dentry_attr+0x2d1/0x470 [cifs]\n      cifs_getattr+0x28e/0x450 [cifs]\n      vfs_getattr_nosec+0x126/0x180\n      vfs_statx+0xf6/0x220\n      do_statx+0xab/0x110\n      __x64_sys_statx+0xd5/0x130\n      do_syscall_64+0xbb/0x380\n      entry_SYSCALL_64_after_hwframe+0x77/0x7f"
          }
        ],
        "id": "CVE-2025-68295",
        "lastModified": "2026-10-14T16:10:00.250",
        "metrics": {
          "ssvcV203": [
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        "vulnStatus": "Deferred"
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:37:16+00:00",
      "cve": "CVE-2025-68295",
      "id": "CVE-2025-68295",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: fix memory leak in cifs_construct_tcon()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68295.json",
      "version": "3"
    },
    "vulnrichment": {
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                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T16:54:11.171368Z",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
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              "product": "Linux",
              "programFiles": [
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                  "status": "affected",
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                {
                  "status": "affected",
                  "version": "904847402bd74a28164bd4d8da082d1eace7c190",
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              ],
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              "vendor": "Linux",
              "versions": [
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                  "version": "5.3"
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "5.10.247",
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                },
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                  "status": "unaffected",
                  "version": "5.15.197",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.159",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.119",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.61",
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                  "status": "unaffected",
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.247",
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                      "vulnerable": true
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix memory leak in cifs_construct_tcon()\n\nWhen having a multiuser mount with domain= specified and using\ncifscreds, cifs_set_cifscreds() will end up setting @ctx-\u003edomainname,\nso it needs to be freed before leaving cifs_construct_tcon().\n\nThis fixes the following memory leak reported by kmemleak:\n\n  mount.cifs //srv/share /mnt -o domain=ZELDA,multiuser,...\n  su - testuser\n  cifscreds add -d ZELDA -u testuser\n  ...\n  ls /mnt/1\n  ...\n  umount /mnt\n  echo scan \u003e /sys/kernel/debug/kmemleak\n  cat /sys/kernel/debug/kmemleak\n  unreferenced object 0xffff8881203c3f08 (size 8):\n    comm \"ls\", pid 5060, jiffies 4307222943\n    hex dump (first 8 bytes):\n      5a 45 4c 44 41 00 cc cc                          ZELDA...\n    backtrace (crc d109a8cf):\n      __kmalloc_node_track_caller_noprof+0x572/0x710\n      kstrdup+0x3a/0x70\n      cifs_sb_tlink+0x1209/0x1770 [cifs]\n      cifs_get_fattr+0xe1/0xf50 [cifs]\n      cifs_get_inode_info+0xb5/0x240 [cifs]\n      cifs_revalidate_dentry_attr+0x2d1/0x470 [cifs]\n      cifs_getattr+0x28e/0x450 [cifs]\n      vfs_getattr_nosec+0x126/0x180\n      vfs_statx+0xf6/0x220\n      do_statx+0xab/0x110\n      __x64_sys_statx+0xd5/0x130\n      do_syscall_64+0xbb/0x380\n      entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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        "dateReserved": "2025-12-16T14:48:05.293Z",
        "dateUpdated": "2026-06-16T16:54:20.236Z",
        "state": "PUBLISHED"
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  }
}



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