CVE-2025-68304— Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
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I. Basic Information for CVE-2025-68304
Vulnerability Information
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Vulnerability Title
Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: lookup hci_conn on RX path on protocol side The hdev lock/lookup/unlock/use pattern in the packet RX path doesn't ensure hci_conn* is not concurrently modified/deleted. This locking appears to be leftover from before conn_hash started using RCU commit bf4c63252490b ("Bluetooth: convert conn hash to RCU") and not clear if it had purpose since then. Currently, there are code paths that delete hci_conn* from elsewhere than the ordered hdev->workqueue where the RX work runs in. E.g. commit 5af1f84ed13a ("Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync") introduced some of these, and there probably were a few others before it. It's better to do the locking so that even if these run concurrently no UAF is possible. Move the lookup of hci_conn and associated socket-specific conn to protocol recv handlers, and do them within a single critical section to cover hci_conn* usage and lookup. syzkaller has reported a crash that appears to be this issue: [Task hdev->workqueue] [Task 2] hci_disconnect_all_sync l2cap_recv_acldata(hcon) hci_conn_get(hcon) hci_abort_conn_sync(hcon) hci_dev_lock hci_dev_lock hci_conn_del(hcon) v-------------------------------- hci_dev_unlock hci_conn_put(hcon) conn = hcon->l2cap_data (UAF)
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于并发修改可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-68304
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Same Patch Batch · Linux · 2025-12-16 · 157 CVEs total
| CVE-2025-68263 | 9.8 CRITICAL | ksmbd: ipc: fix use-after-free in ipc_msg_send_request |
| CVE-2025-68259 | KVM: SVM: Don't skip unrelated instruction if INT3/INTO is replaced | |
| CVE-2025-68250 | hung_task: fix warnings caused by unaligned lock pointers | |
| CVE-2025-68251 | erofs: avoid infinite loops due to corrupted subpage compact indexes | |
| CVE-2025-68252 | misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup | |
| CVE-2025-68253 | mm: don't spin in add_stack_record when gfp flags don't allow | |
| CVE-2025-68254 | staging: rtl8723bs: fix out-of-bounds read in OnBeacon ESR IE parsing | |
| CVE-2025-68255 | staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing | |
| CVE-2025-68256 | staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser | |
| CVE-2025-68257 | comedi: check device's attached status in compat ioctls | |
| CVE-2025-68258 | comedi: multiq3: sanitize config options in multiq3_attach() | |
| CVE-2025-68264 | ext4: refresh inline data size before write operations | |
| CVE-2025-68282 | usb: gadget: udc: fix use-after-free in usb_gadget_state_work | |
| CVE-2025-68281 | ASoC: SDCA: bug fix while parsing mipi-sdca-control-cn-list | |
| CVE-2025-68266 | bfs: Reconstruct file type when loading from disk | |
| CVE-2025-68265 | nvme: fix admin request_queue lifetime | |
| CVE-2025-68261 | ext4: add i_data_sem protection in ext4_destroy_inline_data_nolock() | |
| CVE-2025-68260 | rust_binder: fix race condition on death_list | |
| CVE-2025-68249 | most: usb: hdm_probe: Fix calling put_device() before device initialization | |
| CVE-2025-68262 | crypto: zstd - fix double-free in per-CPU stream cleanup |
Showing top 20 of 157 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-68304
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