CVE-2025-38244 — smb: client: fix potential deadlock when reconnecting channels

Affected: Linux

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

smb: client: fix potential deadlock when reconnecting channels

Fix cifs_signal_cifsd_for_reconnect() to take the correct lock order and prevent the following deadlock from happening

====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc3-build2+ #1301 Tainted: G S W ------------------------------------------------------ cifsd/6055 is trying to acquire lock: ffff88810ad56038 (&tcp_ses->srv_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0x134/0x200

but task is already holding lock: ffff888119c64330 (&ret_buf->chan_lock){+.+.}-{3:3}, at: cifs_signal_cifsd_for_reconnect+0xcf/0x200

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #2 (&ret_buf->chan_lock){+.+.}-{3:3}: validate_chain+0x1cf/0x270 __lock_acquire+0x60e/0x780 lock_acquire.part.0+0xb4/0x1f0 _raw_spin_lock+0x2f/0x40 cifs_setup_session+0x81/0x4b0 cifs_get_smb_ses+0x771/0x900 cifs_mount_get_session+0x7e/0x170 cifs_mount+0x92/0x2d0 cifs_smb3_do_mount+0x161/0x460 smb3_get_tree+0x55/0x90 vfs_get_tree+0x46/0x180 do_new_mount+0x1b0/0x2e0 path_mount+0x6ee/0x740 do_mount+0x98/0xe0 __do_sys_mount+0x148/0x180 do_syscall_64+0xa4/0x260 entry_SYSCALL_64_after_hwframe+0x76/0x7e

-> #1 (&ret_buf->ses_lock){+.+.}-{3:3}:…

USN-7798-1 — linux-azure vulnerabilities

Affected: Ubuntu:25.04: linux-azure

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Network drivers; - SMB network file system; - Packet sockets; - Network traffic control; - VMware vSockets driver; - XFRM subsystem; (CVE-2025-38244, CVE-2025-38477, CVE-2025-38617, CVE-2025-38683, CVE-2025-38618, CVE-2025-38500)

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CVE-2025-38244 — smb: client: fix potential deadlock when reconnecting channels

USN-7798-1 — linux-azure vulnerabilities