Vulnerability identifier: #VU6726

Vulnerability risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7910

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system
linux_kernel (Debian package)
Operating systems & Components / Operating system package or component

Vendor: Linux Foundation
Debian

Description
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 disk_seqf_stop function in block/genhd.c. a local attacker can leverage the execution of a certain stop operation and execute arbitrary code on the system with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to 4.7.1.

Vulnerable software versions

Linux kernel: 4.7.0, 4.6.0 - 4.6.7, 4.5.0 - 4.5.7, 4.4.0 - 4.4.70, 4.3.1 - 4.3.6, 4.2.0 - 4.2.8, 4.1.1 - 4.1.40, 4.0.1 - 4.0.9

linux_kernel (Debian package): 4.6.4-1

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External links
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=77da160530dd1dc94f6ae1...

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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.