Ubuntu update for Linux kernel



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2015-7872
CVE-2015-8104
CWE-ID CWE-20
CWE-703
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU2510

Risk: Low

CVSSv4.0: 4.3 [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]

CVE-ID: CVE-2015-7872

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The weakness exists in the key_gc_unused_keys function in security/keys/gc.c due to improper input validation. A local attacker can submit specially crafted keyctl commands and cause the service to crash.

Mitigation

Update the affected packages

Ubuntu 12.04 LTS:
linux-image-3.2.0-96-generic 3.2.0-96.136
linux-image-3.2.0-96-powerpc-smp 3.2.0-96.136
linux-image-3.2.0-96-virtual 3.2.0-96.136
linux-image-3.2.0-96-highbank 3.2.0-96.136
linux-image-3.2.0-96-omap 3.2.0-96.136
linux-image-3.2.0-96-generic-pae 3.2.0-96.136
linux-image-3.2.0-96-powerpc64-smp 3.2.0-96.136

Vulnerable software versions

Ubuntu: 12.04

CPE2.3 External links

https://www.ubuntu.com/usn/usn-2840-1/


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper check or handling of exceptional conditions

EUVDB-ID: #VU3002

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-8104

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The weakness exists in the KVM subsystem due to many #DB (aka Debug) exceptions, related to svm.c. An adjacent attacker can cause the service to crash.

Mitigation

Update the affected packages

Ubuntu 12.04 LTS:
linux-image-3.2.0-96-generic 3.2.0-96.136
linux-image-3.2.0-96-powerpc-smp 3.2.0-96.136
linux-image-3.2.0-96-virtual 3.2.0-96.136
linux-image-3.2.0-96-highbank 3.2.0-96.136
linux-image-3.2.0-96-omap 3.2.0-96.136
linux-image-3.2.0-96-generic-pae 3.2.0-96.136
linux-image-3.2.0-96-powerpc64-smp 3.2.0-96.136

Vulnerable software versions

Ubuntu: 12.04

CPE2.3
External links

https://www.ubuntu.com/usn/usn-2840-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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