CVE-2023-53246 (GCVE-0-2023-53246)
Vulnerability from cvelistv5
Published
2025-09-15 14:46
Modified
2025-09-15 14:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL When compiled with CONFIG_CIFS_DFS_UPCALL disabled, cifs_dfs_d_automount is NULL. cifs.ko logic for mapping CIFS_FATTR_DFS_REFERRAL attributes to S_AUTOMOUNT and corresponding dentry flags is retained regardless of CONFIG_CIFS_DFS_UPCALL, leading to a NULL pointer dereference in VFS follow_automount() when traversing a DFS referral link: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... Call Trace: <TASK> __traverse_mounts+0xb5/0x220 ? cifs_revalidate_mapping+0x65/0xc0 [cifs] step_into+0x195/0x610 ? lookup_fast+0xe2/0xf0 path_lookupat+0x64/0x140 filename_lookup+0xc2/0x140 ? __create_object+0x299/0x380 ? kmem_cache_alloc+0x119/0x220 ? user_path_at_empty+0x31/0x50 user_path_at_empty+0x31/0x50 __x64_sys_chdir+0x2a/0xd0 ? exit_to_user_mode_prepare+0xca/0x100 do_syscall_64+0x42/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc This fix adds an inline cifs_dfs_d_automount() {return -EREMOTE} handler when CONFIG_CIFS_DFS_UPCALL is disabled. An alternative would be to avoid flagging S_AUTOMOUNT, etc. without CONFIG_CIFS_DFS_UPCALL. This approach was chosen as it provides more control over the error path.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/179a88a8558bbf42991d361595281f3e45d7edfc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e144b68208e98fd4602c842a7149ba5f41d87fb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26a32a212bc540f4773cd6af8cf73e967d72569c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/657d7c215ca974d366ab1808213f716e1e3aa950
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8afb1fabcec1929db46977e84baeee0cc0e79242
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cd7dbc9c46d51e00a0a8372e07cc1cbb8d24a77
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b64305185b76f1d5145ce594ff48f3f0e70695bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7d854c33ab48e55fc233699bbefe39ec9bb5c05
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/cifsfs.h"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "4.14.312",
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              "version": "4.19.280",
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              "version": "5.4.240",
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              "version": "5.10.177",
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              "status": "unaffected",
              "version": "6.1.23",
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              "status": "unaffected",
              "version": "6.2.10",
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            },
            {
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              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL\n\nWhen compiled with CONFIG_CIFS_DFS_UPCALL disabled, cifs_dfs_d_automount\nis NULL. cifs.ko logic for mapping CIFS_FATTR_DFS_REFERRAL attributes to\nS_AUTOMOUNT and corresponding dentry flags is retained regardless of\nCONFIG_CIFS_DFS_UPCALL, leading to a NULL pointer dereference in\nVFS follow_automount() when traversing a DFS referral link:\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  ...\n  Call Trace:\n   \u003cTASK\u003e\n   __traverse_mounts+0xb5/0x220\n   ? cifs_revalidate_mapping+0x65/0xc0 [cifs]\n   step_into+0x195/0x610\n   ? lookup_fast+0xe2/0xf0\n   path_lookupat+0x64/0x140\n   filename_lookup+0xc2/0x140\n   ? __create_object+0x299/0x380\n   ? kmem_cache_alloc+0x119/0x220\n   ? user_path_at_empty+0x31/0x50\n   user_path_at_empty+0x31/0x50\n   __x64_sys_chdir+0x2a/0xd0\n   ? exit_to_user_mode_prepare+0xca/0x100\n   do_syscall_64+0x42/0x90\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\nThis fix adds an inline cifs_dfs_d_automount() {return -EREMOTE} handler\nwhen CONFIG_CIFS_DFS_UPCALL is disabled. An alternative would be to\navoid flagging S_AUTOMOUNT, etc. without CONFIG_CIFS_DFS_UPCALL. This\napproach was chosen as it provides more control over the error path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:46:15.977Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8cd7dbc9c46d51e00a0a8372e07cc1cbb8d24a77"
        },
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          "url": "https://git.kernel.org/stable/c/657d7c215ca974d366ab1808213f716e1e3aa950"
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          "url": "https://git.kernel.org/stable/c/26a32a212bc540f4773cd6af8cf73e967d72569c"
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        },
        {
          "url": "https://git.kernel.org/stable/c/179a88a8558bbf42991d361595281f3e45d7edfc"
        }
      ],
      "title": "cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53246",
    "datePublished": "2025-09-15T14:46:15.977Z",
    "dateReserved": "2025-09-15T14:19:21.848Z",
    "dateUpdated": "2025-09-15T14:46:15.977Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53246\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:51.803\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL\\n\\nWhen compiled with CONFIG_CIFS_DFS_UPCALL disabled, cifs_dfs_d_automount\\nis NULL. cifs.ko logic for mapping CIFS_FATTR_DFS_REFERRAL attributes to\\nS_AUTOMOUNT and corresponding dentry flags is retained regardless of\\nCONFIG_CIFS_DFS_UPCALL, leading to a NULL pointer dereference in\\nVFS follow_automount() when traversing a DFS referral link:\\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\\n  ...\\n  Call Trace:\\n   \u003cTASK\u003e\\n   __traverse_mounts+0xb5/0x220\\n   ? cifs_revalidate_mapping+0x65/0xc0 [cifs]\\n   step_into+0x195/0x610\\n   ? lookup_fast+0xe2/0xf0\\n   path_lookupat+0x64/0x140\\n   filename_lookup+0xc2/0x140\\n   ? __create_object+0x299/0x380\\n   ? kmem_cache_alloc+0x119/0x220\\n   ? user_path_at_empty+0x31/0x50\\n   user_path_at_empty+0x31/0x50\\n   __x64_sys_chdir+0x2a/0xd0\\n   ? exit_to_user_mode_prepare+0xca/0x100\\n   do_syscall_64+0x42/0x90\\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc\\n\\nThis fix adds an inline cifs_dfs_d_automount() {return -EREMOTE} handler\\nwhen CONFIG_CIFS_DFS_UPCALL is disabled. An alternative would be to\\navoid flagging S_AUTOMOUNT, etc. without CONFIG_CIFS_DFS_UPCALL. This\\napproach was chosen as it provides more control over the error path.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/179a88a8558bbf42991d361595281f3e45d7edfc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e144b68208e98fd4602c842a7149ba5f41d87fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26a32a212bc540f4773cd6af8cf73e967d72569c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/657d7c215ca974d366ab1808213f716e1e3aa950\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8afb1fabcec1929db46977e84baeee0cc0e79242\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cd7dbc9c46d51e00a0a8372e07cc1cbb8d24a77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b64305185b76f1d5145ce594ff48f3f0e70695bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7d854c33ab48e55fc233699bbefe39ec9bb5c05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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