SB2021071622 - Anolis OS update for kernel(RHCK)4.18 (Anolis OS 8.4)

Description

This security bulletin contains information about 2 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) Use-after-free (CVE-ID: CVE-2021-33034)

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

The vulnerability exists due to a use-after-free error in net/bluetooth/hci_event.c when destroying an hci_chan. A local user can escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://anas.openanolis.cn/errata/detail/ANSA-2021:0034