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

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2025-12-16 15:06
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.
Assigner
References
Impacted products
Vendor Product Version
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)
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    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)
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{
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      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:14.977Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ff8f9bd1c46ee02d5558293915d42e82646d5ee9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d146e96fef876492979658dce644305de35878d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/3dd546e867e94c2f954bca45a961b6104ba708b6"
        },
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          "url": "https://git.kernel.org/stable/c/f62ffdfb431bdfa4b6d24233b7fd830eca0b801e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3184b6a5a24ec9ee74087b2a550476f386df7dc2"
        }
      ],
      "title": "smb: client: fix memory leak in cifs_construct_tcon()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68295",
    "datePublished": "2025-12-16T15:06:14.977Z",
    "dateReserved": "2025-12-16T14:48:05.293Z",
    "dateUpdated": "2025-12-16T15:06:14.977Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68295\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T16:16:08.423\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3184b6a5a24ec9ee74087b2a550476f386df7dc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3dd546e867e94c2f954bca45a961b6104ba708b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a67e91d5f446e455dd9201cdd6e865f7078d251d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d146e96fef876492979658dce644305de35878d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f15288c137d960836277d0e3ecc62de68e52f00f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f62ffdfb431bdfa4b6d24233b7fd830eca0b801e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff8f9bd1c46ee02d5558293915d42e82646d5ee9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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