SB2016012021 - Fedora 22 update for kernel

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Information exposure (CVE-ID: CVE-2015-8569)

The vulnerability allows a local privileged user to gain access to sensitive information.

The vulnerability exists due to information exposure error within the pptp_bind() and pptp_connect() functions in drivers/net/ppp/pptp.c. A local privileged user can gain access to sensitive information.

2) Information exposure (CVE-ID: CVE-2015-8575)

The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.

The vulnerability exists due to information exposure error within the sco_sock_bind() function in net/bluetooth/sco.c. A local non-authenticated attacker can gain access to sensitive information.

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.

4) 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.

5) Race condition (CVE-ID: CVE-2015-8767)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in net/sctp/sm_sideeffect.c due to improper management of the relationship between a lock and a socket. A local attacker can submit a specially crafted sctp_accept call, trigger race condition and cause the service to crash.

6) 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.

Remediation

Install update from vendor's website.

References

• https://bodhi.fedoraproject.org/updates/FEDORA-2016-f71868ce66