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CVE-2023-53246 (GCVE-0-2023-53246)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2026-05-11 19:41
VLAI
Title
cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 25e195aa1e607f129ab912d29fcfc79239703307 , < 26a32a212bc540f4773cd6af8cf73e967d72569c (git)
Affected: 25e195aa1e607f129ab912d29fcfc79239703307 , < b64305185b76f1d5145ce594ff48f3f0e70695bd (git)
Affected: 25e195aa1e607f129ab912d29fcfc79239703307 , < b7d854c33ab48e55fc233699bbefe39ec9bb5c05 (git)
Affected: 25e195aa1e607f129ab912d29fcfc79239703307 , < 1e144b68208e98fd4602c842a7149ba5f41d87fb (git)
Affected: 25e195aa1e607f129ab912d29fcfc79239703307 , < 179a88a8558bbf42991d361595281f3e45d7edfc (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.177 , ≤ 5.10.* (semver)
Unaffected: 5.15.106 , ≤ 5.15.* (semver)
Unaffected: 6.1.23 , ≤ 6.1.* (semver)
Unaffected: 6.2.10 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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An alternative would be to\\navoid flagging S_AUTOMOUNT, etc. without CONFIG_CIFS_DFS_UPCALL. 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:27:08+00:00",
      "cve": "CVE-2023-53246",
      "id": "CVE-2023-53246",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53246.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:00:21Z",
      "cve": "CVE-2023-53246",
      "id": "CVE-2023-53246",
      "initial_release_date": "2025-09-15T23:27:30Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "337",
      "product_status:recommended": "258",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53246",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53246.json",
      "version": "25"
    }
  }
}



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