{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-52572", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52572", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-03-02T21:59:41.980Z", "updatedAt": "2026-08-05T09:10:27.034Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "cifs: Fix UAF in cifs_demultiplex_thread()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix UAF in cifs_demultiplex_thread()\n\nThere is a UAF when xfstests on cifs:\n\n BUG: KASAN: use-after-free in smb2_is_network_name_deleted+0x27/0x160\n Read of size 4 at addr ffff88810103fc08 by task cifsd/923\n\n CPU: 1 PID: 923 Comm: cifsd Not tainted 6.1.0-rc4+ #45\n ...\n Call Trace:\n \n dump_stack_lvl+0x34/0x44\n print_report+0x171/0x472\n kasan_report+0xad/0x130\n kasan_check_range+0x145/0x1a0\n smb2_is_network_name_deleted+0x27/0x160\n cifs_demultiplex_thread.cold+0x172/0x5a4\n kthread+0x165/0x1a0\n ret_from_fork+0x1f/0x30\n \n\n Allocated by task 923:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n __kasan_slab_alloc+0x54/0x60\n kmem_cache_alloc+0x147/0x320\n mempool_alloc+0xe1/0x260\n cifs_small_buf_get+0x24/0x60\n allocate_buffers+0xa1/0x1c0\n cifs_demultiplex_thread+0x199/0x10d0\n kthread+0x165/0x1a0\n ret_from_fork+0x1f/0x30\n\n Freed by task 921:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n kasan_save_free_info+0x2a/0x40\n ____kasan_slab_free+0x143/0x1b0\n kmem_cache_free+0xe3/0x4d0\n cifs_small_buf_release+0x29/0x90\n SMB2_negotiate+0x8b7/0x1c60\n smb2_negotiate+0x51/0x70\n cifs_negotiate_protocol+0xf0/0x160\n cifs_get_smb_ses+0x5fa/0x13c0\n mount_get_conns+0x7a/0x750\n cifs_mount+0x103/0xd00\n cifs_smb3_do_mount+0x1dd/0xcb0\n smb3_get_tree+0x1d5/0x300\n vfs_get_tree+0x41/0xf0\n path_mount+0x9b3/0xdd0\n __x64_sys_mount+0x190/0x1d0\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe UAF is because:\n\n mount(pid: 921) | cifsd(pid: 923)\n-------------------------------|-------------------------------\n | cifs_demultiplex_thread\nSMB2_negotiate |\n cifs_send_recv |\n compound_send_recv |\n smb_send_rqst |\n wait_for_response |\n wait_event_state [1] |\n | standard_receive3\n | cifs_handle_standard\n | handle_mid\n | mid->resp_buf = buf; [2]\n | dequeue_mid [3]\n KILL the process [4] |\n resp_iov[i].iov_base = buf |\n free_rsp_buf [5] |\n | is_network_name_deleted [6]\n | callback\n\n1. After send request to server, wait the response until\n mid->mid_state != SUBMITTED;\n2. Receive response from server, and set it to mid;\n3. Set the mid state to RECEIVED;\n4. Kill the process, the mid state already RECEIVED, get 0;\n5. Handle and release the negotiate response;\n6. UAF.\n\nIt can be easily reproduce with add some delay in [3] - [6].\n\nOnly sync call has the problem since async call's callback is\nexecuted in cifsd process.\n\nAdd an extra state to mark the mid state to READY before wakeup the\nwaitter, then it can get the resp safely.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "fe87e2d0e6265859c659a3ef1e2559a83c5e8e68" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "99960d282fba6634fa758df4124cb73ef8a77d8a" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "ed3b36f351d97dacb62cd0f399e8cf79f73bd30a" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "908b3b5e97d25e879de3d1f172a255665491c2c3" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "76569e3819e0bb59fc19b1b8688b017e627c268a" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "status": "affected", "versionType": "git", "lessThan": "d527f51331cace562393a8038d870b3e9916686f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.16", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.16" }, { "version": "5.4.297", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.237", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.181", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.56", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.5.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.5.*" }, { "version": "6.6", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }