SB2022062437 - SUSE update for the Linux Kernel

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) Protection Mechanism Failure (CVE-ID: CVE-2020-26541)

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

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c. A local user can escalate privileges on the system.

2) Memory leak (CVE-ID: CVE-2022-1012)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient randomization in the net/ipv4/tcp.c when calculating port offsets in Linux kernel cause by small table perturb size. A remote attacker can cause memory leak and gain access to sensitive information.

3) Use-after-free (CVE-ID: CVE-2022-1966)

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

The vulnerability exists due to a use-after-free error in the Linux kernel's Netfilter subsystem in net/netfilter/nf_tables_api.c. A local user can trigger use-after-free error to escalate privileges on the system.

4) Use-after-free (CVE-ID: CVE-2022-1974)

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

The vulnerability exists due to a use-after-free error in the Linux kernel's NFC core functionality due to a race condition between kobject creation and delete. A local attacker with CAP_NET_ADMIN privilege can leak kernel information and escalate privileges on the system.

5) Uncaught Exception (CVE-ID: CVE-2022-1975)

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

The vulnerability exists due to an uncaught exception error in the Linux kernel. A remote attacker on the local network can perform a denial of service (DoS) attack.

6) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-20141)

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

The vulnerability exists due to improper imposition of security restrictions in the Linux kernel's components. A local user can trigger the vulnerability to bypass security restrictions bypass and escalate privileges on the system.

7) Use-after-free (CVE-ID: CVE-2022-32250)

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

The vulnerability exists due to a use-after-free incorrect NFT_STATEFUL_EXPR in net/netfilter/nf_tables_api.c in Linux kernel. A local user with ability to create user/net namespaces can execute arbitrary code with root privileges.

Remediation

Install update from vendor's website.

References

• https://www.suse.com/support/update/announcement/2022/suse-su-20222172-1/