SB2017032203 - Denial of service in Linux Kernel
Published: March 22, 2017 Updated: May 7, 2018
Security Bulletin ID
SB2017032203
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Race condition (CVE-ID: CVE-2017-18249)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists in the add_free_nid function due to race condition. A local attacker can trigger memory corruption and cause the service to crash.
2) NULL pointer dereference (CVE-ID: CVE-2017-6951)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists in the keyring_search_aux function in security/keys/keyring.c due to NULL pointer dereference. A local attacker can cause the service to crash via a request_key system call for the "dead" type.
Remediation
Install update from vendor's website.