SB2016022202 - Ubuntu update for Linux kernel (OMAP4)
Published: February 22, 2016
Security Bulletin ID
SB2016022202
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference/Race condition (CVE-ID: CVE-2015-7550)
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 in the keyctl_read_key function in security/keys/keyctl.c due to improper use of a semaphore. A local attacker can submit a specially crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls, trigger NULL pointer dereference and cause the service o crash.
Remediation
Install update from vendor's website.