SB2023061902 - Ubuntu update for linux-oem-6.1

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2023-1380)

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the Broadcom Full MAC Wi-Fi driver (brcmfmac.ko). A local user can trigger an out-of-bounds read error and read contents of kernel memory on the system.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-2002)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper permissions check in the Bluetooth subsystem when handling ioctl system calls of HCI sockets. A local user can acquire a trusted socket, leading to unauthorized execution of management commands.

3) Reachable Assertion (CVE-ID: CVE-2023-2156)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when handling IPv6 RPL protocol. A remote attacker can send specially crafted packets to the system and perform a denial of service (DoS) attack.

4) Improper locking (CVE-ID: CVE-2023-2269)

The vulnerability allows a local user to perform a denial of service attack (DoS).

The vulnerability exists due to double-locking error in table_clear in drivers/md/dm-ioctl.c. A local user can perform a denial of service (DoS) attack.

5) Out-of-bounds write (CVE-ID: CVE-2023-31436)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the qfq_change_class() function in net/sched/sch_qfq.c when handling the MTU value provided to the QFQ Scheduler. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.

6) Race condition (CVE-ID: CVE-2023-32250)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a race condition within the fs/ksmbd/connection.c in ksmbd in Linux kernel when processing SMB2_SESSION_SETUP commands. A remote attacker can exploit the race by sending concurrent session setup and logoff request and execute arbitrary code on the system.

7) Race condition (CVE-ID: CVE-2023-32254)

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a race condition within fs/ksmbd/mgmt/tree_connect.c in ksmbd in Linux kernel when processing SMB2_TREE_DISCONNECT commands. A remote attacker can trigger a use-after-free error using concurrent smb2 tree disconnect requests and execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-6173-1