SB2025101550 - Ubuntu update for linux-azure-6.8
Published: October 15, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) NULL pointer dereference (CVE-ID: CVE-2025-38683)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the netvsc_probe(), netvsc_remove(), netvsc_suspend(), netvsc_event_set_vf_ns() and netvsc_netdev_event() functions in drivers/net/hyperv/netvsc_drv.c. A local user can perform a denial of service (DoS) attack.
2) Use-after-free (CVE-ID: CVE-2025-38618)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the __vsock_bind_connectible() function in net/vmw_vsock/af_vsock.c. A local user can escalate privileges on the system.
3) Improper locking (CVE-ID: CVE-2025-38617)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the packet_set_ring() function in net/packet/af_packet.c. A local user can perform a denial of service (DoS) attack.
4) Use-after-free (CVE-ID: CVE-2025-38500)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the xfrmi_changelink() function in net/xfrm/xfrm_interface_core.c. A local user can escalate privileges on the system.
5) Use-after-free (CVE-ID: CVE-2025-38477)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the qfq_change_class(), qfq_delete_class(), qfq_dump_class() and qfq_dump_class_stats() functions in net/sched/sch_qfq.c. A local user can escalate privileges on the system.
6) Improper locking (CVE-ID: CVE-2025-38244)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the smb2_query_server_interfaces() and cifs_signal_cifsd_for_reconnect() functions in fs/smb/client/connect.c. A local user can perform a denial of service (DoS) attack.
7) Use-after-free (CVE-ID: CVE-2025-37785)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the __ext4_check_dir_entry() function in fs/ext4/dir.c. A local user can escalate privileges on the system.
8) Resource management error (CVE-ID: CVE-2025-37756)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to resource management error within the tls_setsockopt() and build_protos() functions in net/tls/tls_main.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.