Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix LE list UAF on reset hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a4d5504d5c39cc84f1f828e19967595597a8136e before 8e68c380290b1dd64a0a512ce66d0264130c46ed; affected a4d5504d5c39cc84f1f828e19967595597a8136e before 0628cc9b2fa29985a7b8c774741f8a736b0f5e7c; affected a4d5504d5c39cc84f1f828e19967595597a8136e before d57702d4c55633c243da5a2fec37ae2ad4adb621; affected a4d5504d5c39cc84f1f828e19967595597a8136e before 39a3afb91be3cb465f46ce7a8e5696d9e33edf93; affected a4d5504d5c39cc84f1f828e19967595597a8136e before b55e83a4ba31d40deae22d4e4dc8c84083e953c6; affected a4d5504d5c39cc84f1f828e19967595597a8136e before 25b05e3ce31d954540e99954bcc66cbceb27ab35; affected a4d5504d5c39cc84f1f828e19967595597a8136e before 33af47e847fe4a28b109673affb5874015d54f5a; affected 0de8cd646b0152c9ddd10257d8284938d0df0181; affected 3.18.3 before 3.19 |
| Linux / Linux | affected 3.19; unaffected 0 before 3.19; unaffected 6.1.185 through 6.1.*; unaffected 6.6.154 through 6.6.*; unaffected 6.12.106 through 6.12.*; unaffected 6.18.47 through 6.18.*; unaffected 7.1.11 through 7.1.*; unaffected 7.2.1 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8e68c380290b1dd64a0a512ce66d0264130c46ed
- https://git.kernel.org/stable/c/0628cc9b2fa29985a7b8c774741f8a736b0f5e7c
- https://git.kernel.org/stable/c/d57702d4c55633c243da5a2fec37ae2ad4adb621
- https://git.kernel.org/stable/c/39a3afb91be3cb465f46ce7a8e5696d9e33edf93
- https://git.kernel.org/stable/c/b55e83a4ba31d40deae22d4e4dc8c84083e953c6
- https://git.kernel.org/stable/c/25b05e3ce31d954540e99954bcc66cbceb27ab35
- https://git.kernel.org/stable/c/33af47e847fe4a28b109673affb5874015d54f5a