SB2018081708 - Information disclosure in Linux Kernel

Description

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2018-5953)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists in the swiotlb_print_info() function, as defined in the lib/swiotlb.c source code file due to the printk function prints kernel-object address information. A local attacker can access the system and use a software IO TLB call to read the kernel log.

2) Information disclosure (CVE-ID: CVE-2018-5995)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists in the pcpu_embed_first_chunk() function, as defined in the mm/percpu.c source code file due to the printk function prints kernel-object address information. A local attacker can access the system and use a a pages/cpu call to read the kernel log.

Remediation

Install update from vendor's website.

References

• https://github.com/johnsonwangqize/cve-linux/blob/master/%20CVE-2018-5953.md
• https://github.com/johnsonwangqize/cve-linux/blob/master/CVE-2018-5995.md