# CVE-2025-68305

## Summary

- **CVE ID:** CVE-2025-68305
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Dec 16, 2025
- **Last Modified:** Sep 17, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sock: Prevent race in socket write iter and sock bind

There is a potential race condition between sock bind and socket write
iter. bind may free the same cmd via mgmt_pending before write iter sends
the cmd, just as syzbot reported in UAF[1].

Here we use hci_dev_lock to synchronize the two, thereby avoiding the
UAF mentioned in [1].

[1]
syzbot reported:
BUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316
Read of size 8 at addr ffff888077164818 by task syz.0.17/5989
Call Trace:
 mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316
 set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918
 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719
 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 sock_write_iter+0x279/0x360 net/socket.c:1195

Allocated by task 5989:
 mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296
 set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910
 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719
 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 sock_write_iter+0x279/0x360 net/socket.c:1195

Freed by task 5991:
 mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]
 mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257
 mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477
 hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314

## Affected Products

- Linux — Linux (bdd56875c6926d8009914f427df71797693e90d4)
- Linux — Linux (4e83f2dbb2bf677e614109df24426c4dded472d4)
- Linux — Linux (6fe26f694c824b8a4dbf50c635bee1302e3f099c)
- Linux — Linux (d7882db79135c829a922daf3571f33ea1e056ae3)
- Linux — Linux (6.16)
- Linux — Linux (0)
- Linux — Linux (6.6.119)
- Linux — Linux (6.12.61)
- Linux — Linux (6.17.11)
- Linux — Linux (6.18)
- Linux — Linux (6.6.94)
- Linux — Linux (6.12.34)
- Linux — Linux (6.15.3)
- Linux — Linux (7b5958332f20dc66b19be564c402dbc21b927a81)

## References

- [CNA](https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a)
- [CNA](https://git.kernel.org/stable/c/e90c05fc5bbea956450a05cc3b36b8fa29cf195e)
- [CNA](https://git.kernel.org/stable/c/69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7)
- [CNA](https://git.kernel.org/stable/c/89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392)
- [CNA](https://git.kernel.org/stable/c/7344feaed3c8aa46d397984ae855e6026d3c3e95)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._