SB2022081742 - SUSE update for the Linux Kernel

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Out-of-bounds write (CVE-ID: CVE-2021-33655)

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

The vulnerability exists due to a boundary error in FBIOPUT_VSCREENINFO IOCTL. A local user can trigger an out-of-bounds write error and execute arbitrary code with elevated privileges.

2) Out-of-bounds read (CVE-ID: CVE-2022-1462)

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

The vulnerability exists due to a boundary condition within the the Linux kernel’s TeleTYpe subsystem caused by a race condition when using ioctls TIOCSPTLCK and TIOCGPTPEER and TIOCSTI and TCXONC with leakage of memory file. A local user can trigger an out-of-bounds read error and crash the system or read random kernel memory.

3) Security features bypass (CVE-ID: CVE-2022-21505)

The vulnerability allows an attacker to bypass implemented security restrictions.

The vulnerability exists due to incorrect implementation of the IMA lockdown feature. If IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine with Secure Boot. An attacker with physical access to device can bypass Secure Boot mechanism.

4) Improper update of reference count (CVE-ID: CVE-2022-29581)

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

The vulnerability exists due to improper update of reference count in net/sched in Linux kernel. A local user can execute arbitrary code with root privileges.

5) 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-20222722-1/