{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52572", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-02T21:55:42.567Z", "datePublished": "2024-03-02T21:59:41.980Z", "dateUpdated": "2026-08-05T09:10:27.034Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:27.034Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is in the CIFS/SMB client demultiplex path and requires a local TASK_KILLABLE waiter to free the response buffer after mid_state becomes MID_RESPONSE_RECEIVED; a remote SMB peer alone cannot deliver that fatal signal or otherwise free the buffer mid-use.\nAC:L - The attacker controls both sides of the race by issuing sync CIFS operations (compound_send_recv/SendReceive) and delivering SIGKILL to the waiting task once the response is RECEIVED, and can retry indefinitely until the small dequeue→is_network_name_deleted window is hit.\nPR:L - Any unprivileged user with access to an already-mounted CIFS share can drive sync SMB requests and kill their own waiting process; CAP_SYS_ADMIN is not required on the post-mount file-operation path.\nUI:N - In realistic deployments (enterprise NAS home dirs, automounted shares, container CIFS volumes) the mount already exists, and the attacker triggers the race solely with their own I/O and signals.\nS:U - The heap UAF and resulting privilege impact remain within the host kernel’s security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Use-after-free of the mempool response buffer (read in smb2_is_network_name_deleted) is reclaimable/sprayable heap, enabling an arbitrary kernel read primitive per UAF scoring guidance.\nI:H - The same UAF enables heap spraying of the freed SMB response buffer for write/control-flow hijack primitives, and attacker-controlled reclaimed header fields can also corrupt demultiplex handling (e.g. STATUS_NETWORK_NAME_DELETED / TreeId paths).\nA:H - The KASAN report is a kernel use-after-free oops in cifs_demultiplex_thread/smb2_is_network_name_deleted, so the bug denies availability even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/cifsglob.h", "fs/smb/client/transport.c" ], "versions": [ { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "fe87e2d0e6265859c659a3ef1e2559a83c5e8e68", "status": "affected", "versionType": "git" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "99960d282fba6634fa758df4124cb73ef8a77d8a", "status": "affected", "versionType": "git" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "ed3b36f351d97dacb62cd0f399e8cf79f73bd30a", "status": "affected", "versionType": "git" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "908b3b5e97d25e879de3d1f172a255665491c2c3", "status": "affected", "versionType": "git" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "76569e3819e0bb59fc19b1b8688b017e627c268a", "status": "affected", "versionType": "git" }, { "version": "ec637e3ffb6b978143652477c7c5f96c9519b691", "lessThan": "d527f51331cace562393a8038d870b3e9916686f", "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/smb/client/cifsglob.h", "fs/smb/client/transport.c" ], "versions": [ { "version": "2.6.16", "status": "affected" }, { "version": "0", "lessThan": "2.6.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.297", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.237", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.181", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.56", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.6", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "2.6.16", "versionEndExcluding": "5.4.297" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "5.10.237" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "5.15.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.1.56" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.5.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fe87e2d0e6265859c659a3ef1e2559a83c5e8e68" }, { "url": "https://git.kernel.org/stable/c/99960d282fba6634fa758df4124cb73ef8a77d8a" }, { "url": "https://git.kernel.org/stable/c/ed3b36f351d97dacb62cd0f399e8cf79f73bd30a" }, { "url": "https://git.kernel.org/stable/c/908b3b5e97d25e879de3d1f172a255665491c2c3" }, { "url": "https://git.kernel.org/stable/c/76569e3819e0bb59fc19b1b8688b017e627c268a" }, { "url": "https://git.kernel.org/stable/c/d527f51331cace562393a8038d870b3e9916686f" } ], "title": "cifs: Fix UAF in cifs_demultiplex_thread()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52572", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-03-04T14:36:02.875226Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:23:18.290Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/908b3b5e97d25e879de3d1f172a255665491c2c3", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/76569e3819e0bb59fc19b1b8688b017e627c268a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d527f51331cace562393a8038d870b3e9916686f", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:28:45.115Z" } } ] } }