{"id":"CVE-2025-38527","revision":null,"records":[{"revision":"e75d5e1b26094467bdb533dee95ecebc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-38527","aliases":[],"title":"smb: client: fix use-after-free in cifs_oplock_break","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free in cifs_oplock_break\n\nA race condition can occur in cifs_oplock_break() leading to a\nuse-after-free of the cinode structure when unmounting:\n\n cifs_oplock_break()\n _cifsFileInfo_put(cfile)\n cifsFileInfo_put_final()\n cifs_sb_deactive()\n [last ref, start releasing sb]\n kill_sb()\n kill_anon_super()\n generic_shutdown_super()\n evict_inodes()\n dispose_list()\n evict()\n destroy_inode()\n call_rcu(&inode->i_rcu, i_callback)\n spin_lock(&cinode->open_file_lock) <- OK\n [later] i_callback()\n cifs_free_inode()\n kmem_cache_free(cinode)\n spin_unlock(&cinode->open_file_lock) <- UAF\n cifs_done_oplock_break(cinode) <- UAF\n\nThe issue occurs when umount has already released its reference to the\nsuperblock. When _cifsFileInfo_put() calls cifs_sb_deactive(), this\nreleases the last reference, triggering the immediate cleanup of all\ninodes under RCU. However, cifs_oplock_break() continues to access the\ncinode after this point, resulting in use-after-free.\n\nFix this by holding an extra reference to the superblock during the\nentire oplock break operation. This ensures that the superblock and\nits inodes remain valid until the oplock break completes.","state":0,"publishedAt":"2025-08-16T11:12:20.843+00:00","modifiedAt":"2026-10-15T21:52:18.718+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/smb/client/file.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"4256a483fe58af66a46cbf3dc48ff26e580d3308\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"0a4eec84d4d2c4085d4ed8630fd74e4b39033c1b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"2baaf5bbab2ac474c4f92c10fcb3310f824db995\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"09bce2138a30ef10d8821c8c3f73a4ab7a5726bc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"da11bd4b697b393a207f19a2ed7d382a811a3ddc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b98749cac4a695f084a5ff076f4510b23e353ecd\",\n \"lessThan\": \"705c79101ccf9edea5a00d761491a03ced314210\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2429fcf06d3cb962693868ab0a927c9038f12a2d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"53fc31a4853e30d6e8f142b824f724da27ff3e40\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8092ecc306d81186a64cda42411121f4d35aaff4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ebac4d0adf68f8962bd82fcf483936edd6ec095b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3.16.72\",\n \"lessThan\": \"3.17\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.9.171\",\n \"lessThan\": \"4.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.114\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.37\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.0.10\",\n \"lessThan\": \"5.1\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/smb/client/file.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.190\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.147\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.100\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.40\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.15.8\",\n \"lessThanOrEqual\": \"6.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.16\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/4256a483fe58af66a46cbf3dc48ff26e580d3308","https://git.kernel.org/stable/c/0a4eec84d4d2c4085d4ed8630fd74e4b39033c1b","https://git.kernel.org/stable/c/2baaf5bbab2ac474c4f92c10fcb3310f824db995","https://git.kernel.org/stable/c/09bce2138a30ef10d8821c8c3f73a4ab7a5726bc","https://git.kernel.org/stable/c/da11bd4b697b393a207f19a2ed7d382a811a3ddc","https://git.kernel.org/stable/c/705c79101ccf9edea5a00d761491a03ced314210"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38527","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-38527","identifiers":["CVE-2025-38527"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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