{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53246","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-09-15T14:19:21.848Z","datePublished":"2025-09-15T14:46:15.977Z","dateUpdated":"2026-05-11T19:41:04.299Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:41:04.299Z"},"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   <TASK>\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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/cifsfs.h"],"versions":[{"version":"25e195aa1e607f129ab912d29fcfc79239703307","lessThan":"26a32a212bc540f4773cd6af8cf73e967d72569c","status":"affected","versionType":"git"},{"version":"25e195aa1e607f129ab912d29fcfc79239703307","lessThan":"b64305185b76f1d5145ce594ff48f3f0e70695bd","status":"affected","versionType":"git"},{"version":"25e195aa1e607f129ab912d29fcfc79239703307","lessThan":"b7d854c33ab48e55fc233699bbefe39ec9bb5c05","status":"affected","versionType":"git"},{"version":"25e195aa1e607f129ab912d29fcfc79239703307","lessThan":"1e144b68208e98fd4602c842a7149ba5f41d87fb","status":"affected","versionType":"git"},{"version":"25e195aa1e607f129ab912d29fcfc79239703307","lessThan":"179a88a8558bbf42991d361595281f3e45d7edfc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/cifsfs.h"],"versions":[{"version":"5.7","status":"affected"},{"version":"0","lessThan":"5.7","status":"unaffected","versionType":"semver"},{"version":"5.10.177","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.106","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.23","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2.10","lessThanOrEqual":"6.2.*","status":"unaffected","versionType":"semver"},{"version":"6.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.106"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/26a32a212bc540f4773cd6af8cf73e967d72569c"},{"url":"https://git.kernel.org/stable/c/b64305185b76f1d5145ce594ff48f3f0e70695bd"},{"url":"https://git.kernel.org/stable/c/b7d854c33ab48e55fc233699bbefe39ec9bb5c05"},{"url":"https://git.kernel.org/stable/c/1e144b68208e98fd4602c842a7149ba5f41d87fb"},{"url":"https://git.kernel.org/stable/c/179a88a8558bbf42991d361595281f3e45d7edfc"}],"title":"cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL","x_generator":{"engine":"bippy-1.2.0"}}}}