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

Vulnerability from cvelistv5 – Published: 2025-09-15 14:46 – Updated: 2025-09-15 14:46
VLAI?
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8cd7dbc9c46d51e00a0a8372e07cc1cbb8d24a77 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8afb1fabcec1929db46977e84baeee0cc0e79242 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 657d7c215ca974d366ab1808213f716e1e3aa950 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 26a32a212bc540f4773cd6af8cf73e967d72569c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b64305185b76f1d5145ce594ff48f3f0e70695bd (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b7d854c33ab48e55fc233699bbefe39ec9bb5c05 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1e144b68208e98fd4602c842a7149ba5f41d87fb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 179a88a8558bbf42991d361595281f3e45d7edfc (git)
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    Linux Linux Unaffected: 4.14.312 , ≤ 4.14.* (semver)
Unaffected: 4.19.280 , ≤ 4.19.* (semver)
Unaffected: 5.4.240 , ≤ 5.4.* (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)
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{
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An alternative would be to\\navoid flagging S_AUTOMOUNT, etc. without CONFIG_CIFS_DFS_UPCALL. 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  }
}


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Nomenclature

  • 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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Detection rules are retrieved from Rulezet.