发布于3月6日3月6日 Members Red Hat: CVE-2023-52757: kernel: smb: client: fix potential deadlock when releasing mids (Multiple Advisories) Severity 5 CVSS (AV:L/AC:L/Au:S/C:N/I:N/A:C) Published 05/21/2024 Created 12/06/2024 Added 12/05/2024 Modified 01/09/2025 Description In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential deadlock when releasing mids All release_mid() callers seem to hold a reference of @mid so there is no need to call kref_put(&mid->refcount, __release_mid) under @server->mid_lock spinlock.If they don't, then an use-after-free bug would have occurred anyways. By getting rid of such spinlock also fixes a potential deadlock as shown below CPU 0CPU 1 ------------------------------------------------------------------ cifs_demultiplex_thread()cifs_debug_data_proc_show() release_mid() spin_lock(&server->mid_lock); spin_lock(&cifs_tcp_ses_lock) spin_lock(&server->mid_lock) __release_mid() smb2_find_smb_tcon() spin_lock(&cifs_tcp_ses_lock) *deadlock* Solution(s) redhat-upgrade-kernel redhat-upgrade-kernel-rt References CVE-2023-52757 RHSA-2024:9315
