SB2016012024 - Fedora 23 update for kernel

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Main Vulnerability Database SB2016012024

SB2016012024 - Fedora 23 update for kernel

Published: January 20, 2016 Updated: April 24, 2025

Security Bulletin ID SB2016012024
Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Use-after-free error (CVE-ID: CVE-2016-0728)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to use-after-free error in the join_session_keyring() function in security/keys/process_keys.c when handling keyring object reference counting by Linux kernel's key management subsystem. A local attacker can overflow the usage field via a specially crafted object and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

2) NULL pointer dereference (CVE-ID: CVE-2015-7566)

The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the clie_5_attach() function in drivers/usb/serial/visor.c. A local non-authenticated attacker can perform a denial of service (DoS) attack.


3) Division by zero (CVE-ID: CVE-2015-7513)

The vulnerability allows a local user to a crash the entire system.

The vulnerability exists due to a division by zero error within the kvm_vm_ioctl_get_pit(), kvm_vm_ioctl_get_pit2() and kvm_vm_ioctl_set_pit2() functions in arch/x86/kvm/x86.c. A local user can a crash the entire system.


Remediation

Install update from vendor's website.

References