SB2021120226 - SUSE update for the Linux Kernel
Published: December 2, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2021-0941)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists in __bpf_skb_max_len() function in net/core/filter.c in the Linux kernel. A local user with special privilege can gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information.
2) Use of insufficiently random values (CVE-ID: CVE-2021-20322)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to an error when processing received ICMP errors. A remote attacker can effectively bypass the source port UDP randomization to gain access to sensitive information.
3) Out-of-bounds write (CVE-ID: CVE-2021-31916)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module. A special user (CAP_SYS_ADMIN) can trigger a buffer overflow in the ioctl for listing devices and escalate privileges on the system.
4) Double Free (CVE-ID: CVE-2021-34981)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the CMTP module in Linux kernel. A local user can trigger a double free error and execute arbitrary code on the system.
Remediation
Install update from vendor's website.