SUSE update for the Linux Kernel

Published: 2022-10-26

Risk	Low
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2022-2503 CVE-2022-3239 CVE-2022-3303 CVE-2022-41218
CWE-ID	CWE-264 CWE-416 CWE-476
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #4 is available.
Vulnerable software Subscribe	SUSE Linux Enterprise Server Operating systems & Components / Operating system kernel-source Operating systems & Components / Operating system package or component kernel-macros Operating systems & Components / Operating system package or component kernel-devel Operating systems & Components / Operating system package or component kernel-syms Operating systems & Components / Operating system package or component kernel-default-devel Operating systems & Components / Operating system package or component kernel-default-debugsource Operating systems & Components / Operating system package or component kernel-default-debuginfo Operating systems & Components / Operating system package or component kernel-default-base-debuginfo Operating systems & Components / Operating system package or component kernel-default-base Operating systems & Components / Operating system package or component kernel-default Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU66810

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2503

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way dm-verity is used to restrict module/firmware loads to trusted root filesystem in LoadPin builds. Device-mapper table reloads currently allow users with root privileges to switch out the target with an equivalent dm-linear target and bypass verification till reboot. This allows root to bypass LoadPin and can be used to load untrusted and unverified kernel modules and firmware, which implies arbitrary kernel execution and persistence for peripherals that do not verify firmware updates.

Mitigation

Update the affected package the Linux Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

kernel-source: before 4.4.121-92.191.1

kernel-macros: before 4.4.121-92.191.1

kernel-devel: before 4.4.121-92.191.1

kernel-syms: before 4.4.121-92.191.1

kernel-default-devel: before 4.4.121-92.191.1

kernel-default-debugsource: before 4.4.121-92.191.1

kernel-default-debuginfo: before 4.4.121-92.191.1

kernel-default-base-debuginfo: before 4.4.121-92.191.1

kernel-default-base: before 4.4.121-92.191.1

kernel-default: before 4.4.121-92.191.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223779-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU68337

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3239

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the Linux kernel video4linux driver in the way user triggers em28xx_usb_probe() for the Empia 28xx based TV cards. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

kernel-source: before 4.4.121-92.191.1

kernel-macros: before 4.4.121-92.191.1

kernel-devel: before 4.4.121-92.191.1

kernel-syms: before 4.4.121-92.191.1

kernel-default-devel: before 4.4.121-92.191.1

kernel-default-debugsource: before 4.4.121-92.191.1

kernel-default-debuginfo: before 4.4.121-92.191.1

kernel-default-base-debuginfo: before 4.4.121-92.191.1

kernel-default-base: before 4.4.121-92.191.1

kernel-default: before 4.4.121-92.191.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223779-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) NULL pointer dereference

EUVDB-ID: #VU68338

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3303

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in the Linux kernel sound subsystem due to improper locking when handling the SNDCTL_DSP_SYNC ioctl. A privileged local user can trigger a NULL pointer dereference error and perform a denial of service (DoS) attack.

Mitigation

Update the affected package the Linux Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

kernel-source: before 4.4.121-92.191.1

kernel-macros: before 4.4.121-92.191.1

kernel-devel: before 4.4.121-92.191.1

kernel-syms: before 4.4.121-92.191.1

kernel-default-devel: before 4.4.121-92.191.1

kernel-default-debugsource: before 4.4.121-92.191.1

kernel-default-debuginfo: before 4.4.121-92.191.1

kernel-default-base-debuginfo: before 4.4.121-92.191.1

kernel-default-base: before 4.4.121-92.191.1

kernel-default: before 4.4.121-92.191.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223779-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Use-after-free

EUVDB-ID: #VU67657

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2022-41218

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a use-after-free error within the dvb_demux_open() and dvb_dmxdev_release() function in drivers/media/dvb-core/dmxdev.c in Linux kernel. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux Kernel to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP2-BCL

kernel-source: before 4.4.121-92.191.1

kernel-macros: before 4.4.121-92.191.1

kernel-devel: before 4.4.121-92.191.1

kernel-syms: before 4.4.121-92.191.1

kernel-default-devel: before 4.4.121-92.191.1

kernel-default-debugsource: before 4.4.121-92.191.1

kernel-default-debuginfo: before 4.4.121-92.191.1

kernel-default-base-debuginfo: before 4.4.121-92.191.1

kernel-default-base: before 4.4.121-92.191.1

kernel-default: before 4.4.121-92.191.1

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20223779-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.