Linux Kernel
CVE-2024-53186
HIGH
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix use-after-free in SMB request handling
A race condition exists between SMB request handling in ksmbd_conn_handler_loop() and the freeing of ksmbd_conn in the workqueue handler handle_ksmbd_work(). This leads to a UAF.
- KASAN: slab-use-after-free Read in handle_ksmbd_work
- KASAN: slab-use-after-free in rtlock_slowlock_locked
This race condition arises as follows:
ksmbd_conn_handler_loop()waits forconn->r_countto reach zero:
wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
- Meanwhile,
handle_ksmbd_work()decrementsconn->r_countusing
atomic_dec_return(&conn->r_count), and if it reaches zero, calls ksmbd_conn_free(), which frees conn.
- However, after
handle_ksmbd_work()decrementsconn->r_count,
it may still access conn->r_count_q in the following line: waitqueue_active(&conn->r_count_q) or wake_up(&conn->r_count_q) This results in a UAF, as conn has already been freed.
The discovery of this UAF can be referenced in the following PR for syzkaller's support for SMB requests.
AnalysisAI
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in SMB request handling A race condition exists between SMB request handling in. Rated high severity (CVSS 7.0).
Technical ContextAI
This vulnerability is classified under CWE-362. In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in SMB request handling A race condition exists between SMB request handling in ksmbd_conn_handler_loop() and the freeing of ksmbd_conn in the workqueue handler handle_ksmbd_work(). This leads to a UAF. - KASAN: slab-use-after-free Read in handle_ksmbd_work - KASAN: slab-use-after-free in rtlock_slowlock_locked This race condition arises as follows: - ksmbd_conn_handler_loop() waits for conn->r_count to reach zero: wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0); - Meanwhile, handle_ksmbd_work() decrements conn->r_count using atomic_dec_return(&conn->r_count), and if it reaches zero, calls ksmbd_conn_free(), which frees conn. - However, after handle_ksmbd_work() decrements conn->r_count, it may still access conn->r_count_q in the following line: waitqueue_active(&conn->r_count_q) or wake_up(&conn->r_count_q) This results in a UAF, as conn has already been freed. The discovery of this UAF can be referenced in the following PR for syzkaller's support for SMB requests. Affected products include: Linux Linux Kernel.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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External POC / Exploit Code
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